PokerStars No-Limit Hold'em, $2 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

Button ($199.40)
Hero ($198)
BB ($138.10)
UTG ($197)
UTG+1 ($95.05)
MP1 ($169.45)
MP2 ($165.95)
MP3 ($349.55)
CO ($217.40)

Preflop: Hero is SB with K, 5.
UTG calls $2, 1 fold, MP1 calls $2, 1 fold, MP3 calls $2, 2 folds, Hero completes, BB checks.

Flop: ($10) 9, K, Q (5 players)
Hero ???

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I just arrived at the table, so no reads on any of the players in the pot.

What's your move here?

If you c/f here, what's your reasoning?