Answer:
A. Mutually Exclusive
Explanation:
Mutually exclusive events:
Two events are mutually exclusive if they cannot happen together, that is, supposing the events are A and B:

Choosing a student who is a French major or a chemistry major
Since each student only has one major, the student cannot be both a French and a Chemistry major, that is,
, so they are mutually exclusive and the correct answer is given by option A.