Flopped trips, no kicker, with a bet into me. How to play?

[DonkeyDonk]

It's 7-handed 100 NL, 2/3 live. 2 players limp and I call with 4s 2s on the button (with about $80 behind). The blinds check and the flop comes up Jd 4d 4h.

The pot is $12 after the rake and the SB (with about $90) leads out for $20. It's folded to me. What now?

No real reads on the player. It's an average table, active but with no maniacs and I haven't been playing there for that long.

What could the SB's range be? And how do I play the hand?