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Why aren't there more intelligent people in the world? Why is the world so full of idiots? Why hasn't nature produced a average IQ capable of getting humanity off Earth to explore the stars?

Is it because when two people mate:
(A) the genetic code is working with two "idiot" genes and can't splice them together (doesn't know how) to make an "intelligent gene"?
(B) Nature has figured that non-intelligent people have a better chance of reproducing, so the genetic code (while capable of making an 'intelligent' gene) refuses do do so because 'idiot genes' have a better chance at reproducing?
(C) something else?