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

<passage>:
largely by the length of time they were allowed to “cook” in an atomic reactor and soak up radioactivity. 33 “We weren’t planning to run a submarine with it,” his father said. “It wasn’t that strong. Still, it doesn’t take so very much radioactivity to make two ounces of an isotope quite powerful—and quite deadly. I only hope whoever scientist himself?” Eddie asked. “Let’s just say he—or both of them—have enough training in the subject to know how to handle that isotope safely,” Mr. Taylor said. “But, Dad,” Eddie wondered, “what could “They could study it,” his father explained. “At least, they could send it somewhere to be broken down and studied. Being a new isotope, the formula is of great value.” radioactive isotopes without a mighty important “Dinner’s ready,” Eddie’s mother called bother his father with any more questions. He asked if he could go over and visit with Teena be worth a try, at that. You never can tell his mother said, “but I guess it’s all right. Be where you might strike some radioactivity.” Teena answered his knock. Eddie apologized, following her inside. “Hello, Eddie,” Mrs. Ross said, but she looked around for Mr. Ross, but Teena’s “You’re never a pest, Eddie,” Mrs. Ross assured over it,” Teena’s mother said. “Oh, yes,” Eddie affirmed. “He was the one who ordered the isotope.” “What’s an isotope?” Teena asked. “I’m not sure I know, either,” Mrs. Ross said. “Maybe we could understand more of “Hi, Mom,” Eddie said. “Gotta hurry. Big radioisotope is, Eddie.” 36 “Well,” Eddie said slowly, “it’s not easy to explain, but I’ll try. You know how rare uranium is. There’s not nearly enough of it to “Aw, Mom—” “But, Mom—” to school. I’m expecting to receive shipment of a new radioisotope today.” The very word excited Eddie. In fact, anything having to do with atomic science excited him. He knew something about isotopes—pronounced “Why do they do that?” Teena asked. atomic-science department at Oceanview College without picking up a little knowledge along the way. Eddie knew that a radioisotope was a material which had been “cooked” in an atomic reactor until it was “hot” with radioactivity. When carefully controlled, the radiation radioisotope. Much of his father’s work at Oceanview College was of a secret nature. Eddie had learned not to ask questions about “Out of control is right,” Teena said. it to. They have ways of controlling it so that only as much radiation builds up as they want. You can even hear the reactor hum as the radioactive “Boy, that sounds dangerous,” Teena said. “Well, they know just how to do it,” Eddie replied. “Aren’t the rays dangerous?” Mrs. Ross It took Eddie over an hour to sort out the “It takes a lot to stop radioactive atomic particles,” Eddie explained. “Especially the gamma rays. They’re the fastest and most dangerous, “Anything else, Mom?” he asked, returning scientists take certain elements which aren’t radioactive, but can be made radioactive, and shove small pieces of them into holes drilled “Isn’t that dangerous?” Teena asked. be doing Teena Ross a big favor. After all, she was only a girl. Eddie didn’t figure a girl would make a very good uranium prospecting partner, but most of the fellows he knew were will soak up radiation, just like a sponge soaks up water.” 40 “My, that’s interesting, Eddie,” Mrs. Ross said. “I’ve seen them do it,” Eddie said proudly, enough radiation, they pull it back out. They say it’s ‘cooked.’” “You mean it’s hot?” Teena asked. “Oh, hi, Eddie,” Teena greeted him, appearing don’t feel, but it destroys your blood cells and tissues, and—well, you’ve had it.” “So that’s what a radioisotope is,” Mrs. Ross said. “It’s like a sponge. Only instead of soaking up water, it soaks up radiation.” That’s how to handle it, Eddie thought. Don’t act anxious. Let Teena be anxious. isotopes, the whole world is going to be improved. You’ve heard of radiocobalt for curing cancer. Well, that’s an isotope. They make it by cooking cobalt in an atomic reactor. Oh, that as more is learned about the ways to use elements. And there are over a hundred elements. Some soak up a lot of radioactivity, and are strong and dangerous. Others absorb only a little and are pretty safe to use. Depends, too, Eddie went inside and followed Teena to “Dad didn’t say exactly,” Eddie answered, the kitchen. He felt triumphant about the even the mild isotopes are deadly if they’re not handled it carelessly. It was a new isotope—a secret isotope. His father hadn’t said whether it had been developed for curing things or for destroying things. But many radioisotopes could do either the kitchen. “Looks like Teena put you to used. Eddie assumed that anyone who would “She always does, Mrs. Ross,” Eddie said, stoop to stealing isotopes more than likely would be interested in their ability to destroy “I know,” Teena spoke up quickly. “It’s out all right,” Teena’s mother said. it depended on how they were “Oh, we’re glad you did, Eddie,” Mrs. Ross “That’s right, Mrs. Ross,” Eddie agreed. “People should talk more and read more about Mrs. Ross offered. “I know how boys detest doing dishes.” “Oh, I don’t really mind, Mrs. Ross,” Eddie it. After all, this is an atomic age. We might as “Another prospecting trip?” Teena’s “What are we talking about, Eddie?” table, leaned over, and gave both Teena and “Eddie was telling us about atoms,” Teena’s “Not so good,” Teena’s father said tiredly. “It’s all right with me,” Teena agreed, on a new jigsaw puzzle Teena had received on a recent birthday. Then Eddie said good-by “What’s for dinner, Mom?” he asked. Then Eddie heard the sound of his father’s sat stiffly behind his homemade desk, talking rapidly into the telephone. Eddie caught only whether Eddie had discovered any uranium ore that day. Always before, he had shown “Dad,” Eddie said anxiously, “what—what’s “What’s wrong, Dad?” Eddie prompted. “What does that mean, Dad?” Eddie asked, “The radioisotope was stolen, Eddie,” his At the moment, Eddie didn’t pry for further information on the theft of the valuable radioactive isotope. His father had plenty on his mind, as it was. The main information was in the evening , which Eddie rushed out “It wasn’t your fault, was it, Dad?” Eddie that part of it. The important thing is that we recover that radioisotope. Not only is it of a secret nature, but it is also dangerously “But—but wasn’t it in a safe container?” think it was any kid, Eddie. Not by a long “Dad,” Eddie asked, looking up from the “But, Dad,” Eddie continued, “how would a radioisotope,” Eddie said. “Maybe they figured there was something else inside of that food, or even as a source of power.” “Power?” Eddie said. “Boy, it must have been a strong isotope.” He knew that the strength of radioisotopes could be controlled

<question>:
What is Eddie's response to Teena's mother's concern over the missing isotope?

<options>:
A He only causes more concern for her after explaining isotopes.
B He acts equally as concerned as her.
C He tries to comfort her by explaining isotopes.
D He tries to demonstrate his knowledge of radioactivity to her.

<answer>:

C