Answer: B - Both partners must say yes to consent to sexual activity.
Step-by-step explanation:
Affirmative consent is a consent in which both the parties involved agree for the sexual conduct, either by clean and verbal communication or through nonverbal cues or gestures. The affirmative consent cannot be given and taken if a person is unconscious in sleep or is intoxicated with drugs or alcohol.
Thus based on the above explanation, both partners must say yes to sexual activity is affirmative consent.