3 possible buttons for this river spot

[TomChan]

UTG is the tablefish, loose and bad, overplays but not too much wts
all i have on BU is his stats, 23/20 on just 100 hands
no history

i think all 3 options are possible on this river.

PokerStars No-Limit Hold'em, $6 BB (6 handed) Poker Stars Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

CO ($597)
Button ($834.10)
SB ($1377.25)
Hero ($785.35)
UTG ($669.10)
MP ($81)

Preflop: Hero is BB with 7[img]/images/graemlins/club.gif[/img], 7[img]/images/graemlins/heart.gif[/img].
<font color="#CC3333">UTG raises to $18</font>, <font color="#666666">2 folds</font>, Button calls $18, <font color="#666666">1 fold</font>, Hero calls $12.

Flop: ($57) 2[img]/images/graemlins/club.gif[/img], 5[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets $38</font>, UTG folds, Button calls $38.

Turn: ($133) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">Hero bets $102</font>, Button calls $102.

River: ($337) 2[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
Hero checks, <font color="#CC3333">Button bets $268</font>, Hero ???