Statement :
First defeat often becomes a key to victory for some players.
Implications:
I. After first defeat they come to know where they stand and what they have to achieve.
II. After first defeat, every player is bound to win.

The statement says: First defeat often becomes a key to victory for some players.

Implication 1: After first defeat they come to know where they stand and what they have to achieve. This gives us a reason why defeat helps some players to be victorious for the future. So, this is an implicit implication.

Implication 2: After first defeat, every player is bound to win. This statement does not provide any reason as to why defeat becomes a key to victory for some players. So this is not an implicit implication.

Hence, Option (A).