2nd best pair top kicker and BDSD - whats your action?

[rjacobs003]

Reviewing yesterday's session and came across a hand which looked something like this. Whats the thoughts on the play here.

A limps UTG
B limps A [img]/images/graemlins/heart.gif[/img]T [img]/images/graemlins/diamond.gif[/img]
2 fold
C raises
4 folds
A calls
B calls

Flop comes: K [img]/images/graemlins/spade.gif[/img] T [img]/images/graemlins/club.gif[/img] 6 [img]/images/graemlins/heart.gif[/img] (7.5SB)

A bets
B ????

No reads....
wasn't involved in this hand but its an area I sometimes push too hard in so appreciate any thoughts on what the play here is and why.