KK River decision

[CobraGoat]

No Hand history.

50NL 6max, no good reads, villain seemed loose PF, that is all, effective stacks $50.

Hero UTG dealt KK, raises to $2, villain MP calls, all else fold. No flush worries.

Flop: Q95r

Hero bets $4, villain calls.

Turn: 7

Hero bets $9 villain calls

River: J

Hero? b/f, b/c, c/c, or c/f?

My feelings are b/f > b/c >>> c/c >> c/f but i might be way off on that. The problem with b/f is that if villain shoves I am getting like 5.5:1 odds, problem with b/c is that if villain comes over the top im good very rarely as i've repped a strong hand the whole way. c/c sucks cuz there are no apparent draws that villain may have whiffed on to make inducing a bluff profitable and c/f is sooo weak.

Thoughts?