D
1) Since we have a Conditional Statement, let's turn that into the Symbolic Language
If Pedro is not asleep, then he is not snoring
p ⇒ q
Note that we need to express that for the first statement If Pedro is not asleep we have a conclusion: then he is not snoring
2) So we can write the following as the answer. To write the negation of it we'll use that symbol:¬
¬ asleep ⇒ ¬ snoring
Hence, the answer is D