If she were to win the Olympic medal, I for one would be surprised.

If she were to win the Olympic medal, I for one would be surprised.

If she were to go on to win the Olympic medal, I for one would be surprised.

If she becomes the winner of the Olympic medal, I for one would be surprised.

In the event that she would win the Olympic medal, I for one would be surprised.

A. If she were to win the Olympic medal, I for one would be surprised.

No error. Some of the other sentences are also grammatically correct, but are rejected on the grounds that Choice (a) is more concise than them.