PokerStars Pot-Limit Omaha High, $2 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

BB ($138.55)
UTG ($104.05)
UTG+1 ($144.05)
MP1 ($131)
MP2 ($113.25)
Hero ($96)
CO ($381.50)
Button ($138.50)
SB ($321.05)

Preflop: Hero is MP3 with 6, T, 7, 9.
4 folds, Hero calls $2, CO calls $2, Button calls $2, SB completes, BB checks.

Flop: ($10) 9, 5, 4 (5 players)
SB checks, BB checks, Hero checks, CO checks, Button bets $9.5, SB folds, BB folds, Hero ????

easy call

2nd'd with the call

I don't like reraising here, and folding isn't an option. That leaves calling. Call.