If something would have been justifiably regretted if it had occurred, then it is something that one should not have desired in the first place.
Conclusion (It follows that)
Many forgone pleasures should not have been desired in the first place.
Evidence
If something would have been justifiably regretted if it had occurred, then it is something that one should not have desired in the first place.
Evaluate
Since the overlapping ingredient in the Conclusion and the Evidence is , we'll be trying to pick an answer that links together the two dangling ideas, "forgone pleasures" and "something that would have been justifiably regretted".
If we're given a rule that, If something is X, then it is Z
And we're trying to prove that A is Z
Then we need to know that A is X.
[ A is X ] + [ if X, then Z ] = [ A is Z ]
They told us a rule that says,
If JR, then should not have been desired.
We're trying to prove that Many FP's should not have been desired.
So we just need to hear that Many FP's are JR
Goal
Let's look for something that gets us Many Forgone Pleasures would have been Justifiably Regretted.