Learn to draw

It is black turn to move and thought that 1...Bxa4 was the best move. Do you think he is correct?

Answer, highlight inside bracket:

[No!! he is wrong. The light-squared bishop cannot control the a1-h8

diagonal. White immediate plan is to move the king to 2.Kc3 and sacrifice the knight for the c-pawn, and

draw the game. The correct black's move is 1...Be2 2.Kc3 Bxd3 3.Kxd3 Kd6 4.Kd4 c5+ 5.Kc4 Kc6 6.Kc3 Kd5

7.Kd3 c4+ 8.Kc3 Kc5 and black win]