If something would have been justifiably regretted if it had occurred, then it is something that one should not have ...

Mehran on January 25, 2016

No, this is a Strengthen with Sufficient Premise question.

Notice the "follows logically" and the "if."

"If" introduces a sufficient condition and "follows logically" means 100% guaranteed to be true.

Hope this helps! Please let us know if you have any other questions.