PokerStars No-Limit Hold'em, $0.02 BB (9 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: FlopTurnRiver)

MP2 ($4.01)
MP3 ($2.10)
CO ($5.12)
Hero ($2.03)
SB ($4.32)
BB ($4.31)
UTG ($2.47)
UTG+1 ($2.77)
MP1 ($4.05)

Preflop: Hero is Button with 5, 5.
1 fold, UTG+1 calls $0.02, 4 folds, Hero raises to $0.1, 2 folds, UTG+1 calls $0.08.

Flop: ($0.23) A, 6, 8 (2 players)
UTG+1 bets $0.06, Hero ???

Which options do you prefer and why, if any?

1. I have a weak hand and he's probably outflopped me. I only have few outs to improve, the board is somewhat connected and the pot is small. The risk/reward is not worth it. So I fold and wait for a better spot.

2. I have a weak hand. However, his weak donkbet feels like a probing/blocking bet, telling me he has connected with the flop but doesn't want to play a big pot. If I threaten him with a big pot, he'll probably fold his better but weak hand. So I raise hoping for a fold and shutdown if called.

3. You can make a case for both 1. and 2.

4. None of the above. What I'd do is....