How was the table replying to pre-flop agression?

If getting 3 callers suprized you, what does that tell you?
If getting 3 callers didn't suprize you, what the hell were you doing? =)

Solid c-bet on the flop after 3 checked to. Wouldn't change this a bit.

Turn...could go either way. The K is a scare card if the opp fears you having AK, which could be reasonable if he's holding another broadway and hitting his kicker is his insurance policy. I don't think either play is wrong.

River is an clear check behind. A bet here is more likely to confuse then to scare, and it's very unlikely that you hold the best hand - there's no reasonable draw he could have been chasing on that flop.