

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 [King of Diamond and Jack of Spade].
Before the flop, UTG raise 2.0 chips, and BB call. Assume that all other players that is not mentioned folded.
The flop comes Ace Of Diamond, Nine Of Heart, and Eight Of Heart, then BB check, and UTG check.
The turn comes Three Of Spade, then BB bet 5 chips, and UTG call.
The river comes Two Of Club, then BB check, and UTG bet 11 chips.
You currently have High Card(A-high).

Now it is your turn to make a move.
To remind you, the current pot size is 25.0 chips, and your holding is [King of Diamond and Jack of Spade]. You currently have High Card.

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: