Both statements in the sentence have the following structure:
If I eat too much, then I'll exercise.
If p then q.
When we have this structure, we represent it symbolically as:
For these cases, the only situation in which the statement is false is when the first part of the sentence is true, and the second false:
p q p->q
T T V
T F F
F T V
F F V
With this, option C is the correct answer.