25NL: AK faces resistance pf PART I

[JoseyWales]

Reads:

CO is 17.6/14.3/2.4 over 273 hands

Ultimate Bet No-Limit Hold'em, $.25 BB (6 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

MP ($21.62)
CO ($26.43)
Button ($28.60)
SB ($26.72)
BB ($28.41)
Hero ($38.48)

Preflop: Hero is UTG with A[img]/images/graemlins/heart.gif[/img], K[img]/images/graemlins/club.gif[/img].
<font color="#CC3333">Hero raises to $0.85</font>, MP calls $0.85, <font color="#CC3333">CO raises to $3.75</font>, <font color="#666666">3 folds</font>, Hero ???

What's the correct line here?