

You are a specialist in playing 6-handed No Limit Texas Holdem. The following will be a game scenario and you need to make the optimal decision.

Here is a game summary:

The small blind is 0.5 chips and the big blind is 1 chips. Everyone started with 100 chips.
The player positions involved in this game are UTG, HJ, CO, BTN, SB, BB.
In this hand, your position is BB, and your holding is [Queen of Heart and Nine of Diamond].
Before the flop, SB raise 3.0 chips, and BB call. Assume that all other players that is not mentioned folded.
The flop comes Queen Of Club, Eight Of Club, and Ace Of Club, then SB check, and BB check.
The turn comes Three Of Club, then SB bet 5 chips, and BB call.
The river comes Ace Of Heart, then SB check.


Now it is your turn to make a move.
To remind you, the current pot size is 16.0 chips, and your holding is [Queen of Heart and Nine of Diamond].

Decide on an action based on the strength of your hand on this board, your position, and actions before you. Do not explain your answer.
Your optimal action is: