Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
WORLD. IT DIDN'T EVEN HAVE A CITY. EVERYTHING IT HAD WAS The chordata discerner read Positive over most of the surface. There several tests and went to the cognition scanner. Would it show Thought on the body? Naturally they did not get results at once, nor did they expect to it required a fine adjustment. But they were disappointed that they found the world to make sure we've missed nothing," said Stark. There was one more test to run, one very tricky and difficult of analysis, that with the Extraordinary Perception Locator. This was designed simply to locate a source of superior thought. But this might be so varied or so unfamiliar that often both the machine and the The E. P. Locator had been designed by Glaser. But when the Locator when turned on the inventor himself, The machine replied, with such warmth that its relays chattered, that Glaser did not have extraordinary perception he had only ordinary perception to an extraordinary degree. There is a difference , the machine insisted. others more amenable. And it was for this reason also that the owners of Little Probe had acquired the original machine so cheaply. And there was no denying that the Extraordinary Perception Locator (or Eppel) was a contrary machine. On Earth it had read Positive on a Positive on ninety per cent of the acknowledged superior minds of the Earth. In space it had been a sound guide to the unusual intelligences encountered. Yet on Suzuki-Mi was shown by the test. and got a flick. He then narrowed to a smaller area (apparently one individual, though this could not be certain) and got very definite assumed an air of importance when it ran these tests. produces: the single orange light. It was the equivalent of the shrug of the shoulders in a man. They called it the "You tell me light." So among the intelligences there was at least one that might be extraordinary, though possibly in a crackpot way. It is good to be forewarned. track of the minds. There's nothing but a meadow and some boscage, a sort of fountain or pool, and four streams coming out of it." "Keep on towards the minds," said Stark. "They're our target." "Not a building, not two sticks or stones placed together. That looks Earth-people. But with a difference. Where is that bright light coming from?" but the woman smiled, proving that she was human. "I understand. It is possible that this could go on and on. How is it that you use the English tongue?" "I have only one tongue but it is given to us to be understood by all by the eagle, by the squirrel, by the ass, by the English." the first water ever made. "What do you make of them?" asked Stark. "Human," said Steiner. "It may even be that they are a little more than human. I don't understand that light that surrounds them. And they seem to be clothed, as it were, in dignity." "And very little else," said Father Briton, "though that light trick "And everything grows here," added Steiner. "Those are Earth-fruits and I never saw finer. I've tasted the grapes and plums and pears. The figs and dates are superb, the quince is as flavorsome as a quince can be, the cherries are excellent. And I never did taste such oranges. But I haven't yet tried the—" and he stopped. "If you're thinking what I'm afraid to think," said Gilbert, "then it will be the test at least: whether we're having a pleasant dream or whether this is reality. Go ahead and eat one." "Certainly. Eat. It is the finest fruit in the garden." "Well, the analogy breaks down there," said Stark. "I was almost beginning to believe in the thing. But if it isn't that, then what. and Hawwah mean—?" "Of course they do. You know that as well as I." "I was never a believer. But would it be possible for the exact same proposition to maintain here as on Earth?" did understand the answer, however." "And have you gotten no older in all that time?" "I do not understand what 'older' is. I am as I have been from the beginning." "And do you think that you will ever die?" "To die I do not understand. I am taught that it is a property of "And are you completely happy here?" "Perfectly happy according to my preternatural state. But I am taught that it might be possible to lose that happiness, and then to seek it vainly through all the ages. I am taught that sickness and ageing and that on at least one other unfortunate world it has actually been lost." "Do you consider yourself a knowledgeable man?" "Yes, since I am the only man, and knowledge is natural to man. But I am further blessed. I have a preternatural intellect." Then Stark cut in once more: "There must be some one question you could ask him, Father. Some way to settle it. I am becoming nearly convinced." colors and first move." "No. It would be no contest. I have a preternatural intellect." "Well, I beat a barber who was champion of Germantown. And I beat the and have a go at it." "No. It would be no contest. I would not like to humble you." They learned no more of the real nature of the sphere in their time there. Yet all but one of them were convinced of the reality when they "A crowd would laugh if told of it," said Stark, "but not many would laugh if they had actually seen the place, or them. I am not a gullible man, but I am convinced of this: that this is a pristine and pure world and that ours and all the others we have visited are fallen worlds. we have been seeking for centuries. It would be a crime if anyone disturbed that happiness." "I too am convinced," said Steiner. "It is Paradise itself, where the lion lies down with the lamb, and where the serpent has not prevailed. of the serpent, and intrude and spoil." "I am probably the most skeptical man in the world," said Casper Craig the tycoon, "but I do believe my eyes. I have been there and seen it. It is indeed an unspoiled Paradise perfection. "So much for that. Now to business. Gilbert, take a gram: Ninety Million Square Miles of Pristine Paradise for Sale or Lease. Farming, Ranching, exceptional opportunities for Horticulture. Gold, Silver, Iron, Earth-Type Fauna. Terms. Special Rates for Large Settlement as listed below. Ask for Brochure—Eden Acres Unlimited." Down in the great cave that Old Serpent, a two-legged one among whose names were "Snake-Oil Sam," spoke to his underlings: pomegranate. People aren't becoming any smarter—but they are becoming better researched, and they insist on authenticity. "This is still a perfect come-on here. There is something in human nature that cannot resist the idea of a Perfect Paradise. Folks will whoop and holler to their neighbors to come in droves to spoil and mar is unspoiled. Fortunately I am sagacious enough to take advantage of this trait. And when you start to farm a new world on a shoestring you have to acquire your equipment as you can." He looked proudly around at the great cave with its mountains and tiers "I'm working on it." Casper Craig was still dictating the gram: "Amazing quality of longevity seemingly inherent in the locale. Climate ideal. Daylight or half-light. All twenty-one hours from Planet "Why in cosmos would we want an armed escort?" "It's as phony as a seven-credit note!" "You, a man of the cloth doubt it? And us ready skeptics convinced by our senses? Why do you doubt?" "It is only the unbelieving who believe so easily in obvious frauds. Theologically unsound, dramaturgically weak, philologically impossible, "What?" "If I have a preternatural intellect I wouldn't be afraid of a game of "But it was Paradise in one way," said Steiner at last. "How?"

<question>:
What does the E.P. Locator detect?

<options>:
A Level of Human Activity
B Level of Probing
C Level of Spinal Fluid
D Level of Perception

<answer>:

D