Answer: D. Rent
Explanation:
A fixed expense is an expense that is the same amount every time it is paid. Fixed expenses are also usually paid on a set interval, such as monthly, weekly, etc. While rent may change, overall, it is a set amount that stays consistent.
This differs from gasoline, clothing, and travel, because these amounts can vary a lot. For example, you may only travel once every few years and buy clothing when it's needed.