Definitely A (yes, premarital sex is good).
REASONS:
(1) If you choose B and get married at 35, that means for the first
35 years of your life (the best and most horny years), you don't
have sex? Walau....difficult lah.
(2) Besides, you don't wanna grow old, then look back and regret
that you didn't have enough fun during your younger days.
(3) Sex is a natural need. And its just not natural for the young
and active to not have sex. As they say "if you're getting enough,
you don't think about it too much".
(4) Very importantly, there is such a thing as sexual compatibility
between the two members of any couple. I can imagine that its very
frustrating to marry, then find out that the other party cannot
satisfy you.....then its too late. I personally know of some
couples like this and it ends up with one party playing around
outside. (No, what we learned from the elders - eg. can talk it
out, work it out, etc - these theoretical options often don't work
in real life).
(5) Personally, I can't imagine marrying a person who doens't know
anything about sex. I'm not saying I want someone who's had sex
with 1000 partners....but someone at least a little experienced
would be good. (No, what the elders taught us - eg. you will enjoy
sex more after marriage if you don't have premarital sex - doesn't
hold true).