Puzzle 3  (2)

White is in the lead, but has only 2 pieces left in his reserve. So, he must get piece back into his reserve. What should he play to make sure that he will be able to create a row of 4 with his second move?

Possibility 1: a3-c3
Possibility 2: a5-g3
Possibility 3: c6
Possibility 4: e2
Possibility 5: e9-e4
Possibility 6: f1-f3