Underboat on river OOP. 6max 160BB deep.

[sc000t]

Villian here has been pretty passive. Hes been doing a lot of limping and flat calling raises preflop. I haven't seen him play very aggressive post flop as well. He limped in with Ks 2d 2s Qd and just called a lead on the flop and turn then checked behind on the river on a board of [3c 2h Qs 7s] [5h]. I haven't seen him bluff, he doesnt seem like the type but I've been wrong before. I haven't been playing too crazy and have not shown down a bluff or anything unreasonable.

I've been working back into the 6max PLO games and I'd like to know what the best river line is.

PokerStars Pot-Limit Omaha High, $1.00 BB (5 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

SB ($54.85)
BB ($131.45)
Hero ($168.55)
MP ($92.65)
Button ($161.30)

Preflop: Hero is UTG with 3[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/spade.gif[/img], A[img]/images/graemlins/spade.gif[/img].
<font color="#CC3333">Hero raises to $3.5</font>, <font color="#666666">1 fold</font>, Button calls $3.50, <font color="#666666">1 fold</font>, BB calls $2.50.

Flop: ($11) 2[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/spade.gif[/img], 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
BB checks, <font color="#CC3333">Hero bets $8</font>, Button calls $8, BB folds.

Turn: ($27) 9[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $20</font>, Button calls $20.

River: ($67) 9[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
Hero ???

If you bet then how much? Call a raise or b/f?
If you check, you c/c right? If not, how much do you fold to?