Acceptance of an offer should typically be made within________ days, but should be stated in the offer.

The correct answer is based on the common practice in sales agreements, where an acceptance period is critical for ensuring that both parties are held accountable to the terms proposed. Typically, a period of 30 days is standard for acceptance of an offer in various contractual situations, providing a reasonable timeframe for the offeree to review and accept the terms without undue pressure.

This 30-day window allows both parties to engage in discussions or negotiations if necessary, while also establishing a clear deadline that helps prevent misunderstandings or miscommunication regarding the offer's validity. Specifying this period in the offer itself clarifies expectations on both sides, ensuring that the receiving party is aware of how long they have to respond.

In contrast, other timeframes such as 21, 45, or 15 days may be less conventional and could lead to confusion or uncertainty about the time needed to make a decision. Therefore, articulating a 30-day acceptance period is both practical and aligns with standard industry practices, making it the preferred choice.