Which of the following acts is considered sexual assault?

The act of rape is considered sexual assault because it involves non-consensual sexual activity where an individual is forced or coerced into sexual intercourse against their will. It is a serious criminal offense that violates a person's autonomy and bodily integrity. The distinction between consensual activity and sexual assault is critical in understanding the laws surrounding sexual crimes. In cases like rape, consent is absent, and the act is perpetrated through violence, threats, or intimidation.

In contrast, consensual sexual intercourse involves mutual agreement between all parties involved, while adultery refers to a breach of marital fidelity that does not inherently involve coercion or lack of consent. Romantic advances, while they can be unwelcome, do not necessarily constitute sexual assault unless they cross a line into coercion or aggression. Thus, rape is clearly defined as an act of sexual violence, making it the correct answer in identifying what constitutes sexual assault.