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

<passage>:
Kick Me Not long ago, out of curiosity, I picked up some exercise videos by Billy Blanks, the king of Tae-Bo. What a flop. The sets were cheesy, the music was awful 1980s synth-pop, and despite their martial-arts pretensions, the routines felt more like aerobics in disguise than like kung fu. But after flailing away in my living room for a few nights, my interest was piqued, and I decided to find out more about the real thing. Which martial art teaches good self-defense tactics? Which one would give me a good aerobic workout? How daunting would it be to jump into a class as a complete beginner? And would I get pummeled by the other students? To find out, I tried a handful of karate, tae kwon do, aikido, jujitsu, and kung fu classes in the Seattle area. I scored each one in several areas: how intimidating the class would be to a novice how much the exercises worked my muscles how much of an I got how much physical contact with other people was involved and, of course, its value in self-defense. All ratings are on a scale of one to five, with five being the hardest, most intimidating, or most valuable. To experts, this will look like a hopelessly biased and superficial inquiry. It is. But to beginners, it is one step toward figuring out which martial art might be right for you. Do you want a chance to kick the stuffing out of someone? Take tae kwon do. Do you want to improve your sense of balance? Take karate. Do you want to know what to do if someone tries to choke you? Take jujitsu. Just remember that if you're jumped by a mugger, the only thing Tae-Bo will be good for is making your attacker collapse into uncontrollable fits of laughter. Kung Fu Reputation: 1960s martial arts movies In the all-levels group I observed at Seven Star Women's Kung Fu, there were a dozen or so women dressed completely in black. (Most classes I took were co-ed.) The school wouldn't let me take the class--I could only watch--but that was better than Temple Kung Fu, which made me sit for an interview before they'd even reveal any information on their classes. There seemed to be an active screening process to keep out those with only a casual interest. Strength Workout: 3 Aerobic Workout: 2 After the strength work and partner work, the class broke into a few groups (according to skill level) and repeated choreographed routines called "kata ," which involve a series of punches, kicks, and blocks with an imaginary foe. The class had broken into a light sweat, but was not gasping for air. Coordination and Balance:                 4 The moves were neat to look at, but they did not seem practical. And without sparring practice, it would be difficult to apply the drills in real life. Overall: Kicking, punching, and an aura of mystery. Tae Kwon Do Reputation: World's most popular martial art, new Olympic sport I was instantly welcomed into the beginners class at Lee's Martial Arts. People called each other by their first name there was laughing, joking, and none of the aloofness or self-importance of the kung fu class. Strength Workout: 3 Self-Defense Value: 4 Tae kwon do emphasizes sparring and gets students accustomed to dealing with an assault. Overall: More a sport than an art will make short work of flabby legs. Karate the martial art of the 1980s. Intimidation Factor: 1 When I watched a class at the Feminist Karate Union, I asked some of the students how their class was different from the Seven Star Women's Kung Fu class, which is held in the same building. One woman immediately said, "Oh, kung fu? That's what the mean people downstairs do." This class was approachable and open. And karate's so familiar that you feel like you already know how to do it. Strength Workout: 2 We started with sit-ups and push-ups, which were the most demanding parts of the class. The kicking and punching made for decent exercise, but I wasn't aching the next day. The drills (lots of punches, blocking, and kicking) provided some aerobic workout, but were not particularly intense. Coordination and Balance: 4 Keeping yourself centered while kicking and punching develops your balance. This was entirely focused on form no full-force contact between students. Overall: Kicks and punches galore, with a dash of moral and spiritual teaching about self-discipline and obedience. Aikido Despite its reputation, aikido is decidedly nonaggressive--it's about deflecting punches and immobilizing your attacker--and there was a mellow, pleasantly upbeat atmosphere to the class. Strength Workout: 3 No sit-ups or push-ups, but pulling and yanking on other people looked like it would build muscle, and the rolls worked on your abs. To complete the partner exercises, you had to grab your partner, spin him this way and that, and generally come in very close contact. Self-Defense Value: 5 Learning how to neutralize a threat was the main goal of the class. Overall: You don't get to land any punches and it's noncompetitive, but you'll learn how to knock people over. Tai Chi Reputation: What those slow-moving people in the park are doing martial arts for seniors. Intimidation Factor: 1 I found its New Age connections slightly off-putting, but it looks so easy to do that it wasn't daunting. Tai chi involves moving your body slowly in circular patterns, shifting weight from foot to foot, and lifting your arms in rounded gestures, all at a pace slower than you ever thought possible. The motions had names like "parting the wild horse's mane" and "repulsing the monkey." I did not break a sweat, but I was bored to tears. Coordination and Balance: 4 Balance and control of your body position are the heart of this art. Degree of Contact: 0 Self-Defense Value: 0 I learned how to repulse a monkey, not a person. Overall: A yawner, slightly embarrassing to perform, but I'm sure if done correctly it brings high-quality inner peace. Brazilian Jujitsu Intimidation Factor: 5 Although the listing in the phone book advertised the "Brazilian Jiu Jitsu Academy," the sign on the door said "Northwest Fight Club." Inside the club, huge holes had been punched in the walls--some back-size, some fist-size. Huge letters painted on the wall said "TRAIN &amp FIGHT HARD." The instructor, a handsome young Brazilian man, had a long scar curling out from the left side of his mouth and a fresh-looking purple one by his left eye. When I asked to try the class, he shrugged and lent me a gi (the white outfit most martial artists wear), on the back of which was a drawing of massive snarling pit bull and the slogan "PIT PULLING PURE POWER." I wondered if I was going to need an ambulance to take me home. Strength Workout: 5 Self-Defense Value: 5 Jujitsu's few-holds-barred grappling is far more effective when push comes to shove (and worse) than standing arts such as karate. Overall: Lots of grappling, throwing, and choking. Pragmatic, not pretty. High badass quotient.

<question>:
What is the author’s purpose for writing the article?

<options>:
A To tell people how to use martial arts to lose weight.
B To tell people how to use martial arts for self-defense.
C To persuade people to not do martial arts.
D To help beginners find a martial arts class that suits what they are looking for.

<answer>:

D