Jeanious?

I’ve been telling everyone that I’m a genius and now I have proof.

Congratulations, Thomas!
Your IQ score is 140

I received this score after talking a test from tickle.com. I am one hundred percent sure that tickle.com supplies credible tests, so go ahead, see if you are as smart as me (although I doubt it, seriously, 140! I should run for president or something)

p.s. There was one question that I had a little trouble with, so hopefully there is someone out there that is better with numbers than I am (doubtful) and can explain this for me.
7. John likes 400 but not 300; he likes 100 but not 99; he likes 3600 but not 3700. Which does he like?
(a)900
(b)1000
(c)1100
(d)1200