What aspect of consent involves the plaintiff's behavior?

The correct focus is on how consent can be classified as either implied or expressed based on the behavior and circumstances of the plaintiff. Implied consent occurs when a person's actions suggest agreement to a certain conduct, even if it is not explicitly stated. For example, if an individual willingly participates in a contact sport, their participation may be seen as an implicit acceptance of the risks and physical interactions inherent to the sport.

In contrast, expressed consent is when an individual clearly and explicitly states their agreement to something, often in a written form but not necessarily limited to that. The classification of consent as implied or expressed directly relates to how the plaintiff's actions or conduct indicate their acceptance of the situation or risks involved.

The other options might touch on different aspects of consent but do not accurately encapsulate the behavior aspect of it. Writing consent emphasizes formalities that aren’t always necessary, coercion addresses the validity under pressure rather than the behavior indicating consent, and awareness of risks relates to the understanding of consent rather than how consent is communicated through behavior.