what type of literature may a systematic review include to be considered level 1 evidence on the melnyk & fineout-overholt levels of evidence hierarchy?

So you and your partner don’t get sexually transmitted diseases and so your partner doesn’t get pregnant

Behavioral science is the study of human behaviors and how they can be influenced.  by examining patterns in behavior as well as reactions, individuals with behavioral problems can be more adequately treated, resulting in greater mental health of our society/the public.

The answer is d.sarcomas,hope my answer is to you : )