The correct answer is: Only conclusion II follows.
The first statement is in the form “If A, then B.” The second statement is in the form “B.” This is the converse of the first statement. The converse of a statement is not necessarily true. For example, the statement “If it is raining, then the ground is wet” is true. However, the converse of this statement, “If the ground is wet, then it is raining” is not necessarily true. The ground could be wet for other reasons, such as someone having spilled a bucket of water.
In the case of the given statements, the first statement is “If all players play to their full potential, we will win the match.” The second statement is “We have won the match.” This does not necessarily mean that all players played to their full potential. There could be other reasons why we won the match, such as the other team playing poorly.
Therefore, only conclusion II follows. Conclusion I does not necessarily follow.