​European Currency Options Can Be Exercised ____; American Currency Options

Multiple Choice

​European currency options can be exercised ____; American currency options can be exercised ____.

A) ​any time up to the expiration date; any time up to the expiration date
B) ​any time up to the expiration date; only on the expiration date
C) ​only on the expiration date; only on the expiration date
D) ​only on the expiration date; any time up to the expiration date