P = It is a weekend
Q = I will exercise
If "It is a weekend", then "I will exercise"
But "It is NOT a weekend"
Therefore, "I will NOT exercise"
Using P and Q our statement would look like this,
If P, then Q
But not P
Therefore not Q
Or symbolically like this:
P -> Q
~P
[tex]\therefore[/tex] ~Q
I'm sorry that this doesn't match up with the options you posted.
Maybe they didn't paste correctly.