Go ahead and critique my play [whether or not c-betting is smart], but this other guys play smelled really fishy to me. no hand really made sense for how he was playing it

Party Poker No-Limit Hold'em, $ BB (10 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Hero ($50.93)
MP2 ($50)
MP3 ($65.75)
CO ($12.80)
Button ($49.90)
SB ($38.81)
BB ($78.24)
UTG ($29.45)
UTG+1 ($94.03)
UTG+2 ($33.75)

Preflop: Hero is MP1 with K, K. SB posts a blind of $0.25.
1 fold, UTG+1 calls $0.50, 1 fold, Hero raises to $2.5, 1 fold, MP3 calls $2.50, 1 fold, Button calls $2.50, 2 folds, UTG+1 folds.

Flop: ($8.75) 5, Q, A (3 players)
Hero checks, MP3 checks, Button checks.

Turn: ($8.75) 9 (3 players)
Hero checks, MP3 bets $6, Button folds, Hero calls $6.

River: ($20.75) J (2 players)
Hero checks, MP3 calls $57.25 (All-In), Hero folds.

Final Pot: $78