The answer is 3, but I haven't heard of 4 instead of "What do you say to ~~". Is 4 really used or a mistake?
12. Which doesn't belong?
B: I'm for them. They give me so much fun.
① What do you think of computer games?
② How do you like computer games?
③ How about playing computer games?
④ What do you say about computer games?
⑤ What's your opinion on computer games?
4 is used. It's another way of saying 1 or 5.