Endgame Puzzle #6

Here is Puzzle #6!

ANWSER to Puzzle #5: 1. Bg3! d3 2. Bxf2! d2 3. Be1! d1=R (d1=Q?? Stalemate!) 4. Ke2 Ra1 (4...Rc1 5. Bh4 Kg2 6. Kxe3=) 5. Bc3 Ra3 6. Bd4 Kg2 7. Bxe3 and a theoretical Draw!

Puzzle #6 itself: 

Here, white moved 1. Kf2.

A) This move leads to a draw

B) This move is a big mistake, after which white looses. White could play better and force a draw.

For this problem, you will have to, like always, give analysis to prove your answer AND give the BEST MOVE for white. Enjoy!

I would have to say Bf3. Blocks the f pawn and controls the promotion squares for the h and d pawns.

I'm going to say B) This move is a big mistake.

Black can then move Kd4 attacking the bishop.  The bishop does not want to
move as it needs to control both the long diagonal and the d-pawn.

White is dead. At least one pawn will queen.