Choose the correct word to use in the blank.

An "alibi" is an explanation used to demonstrate that a person was elsewhere when an event, typically a crime, occurred. It serves as a defense against accusations but is not generally interchangeable with "justification," which is broader and not limited to proving one's absence or innocence in legal contexts.

The term "rational" describes something based on or in accordance with reason or logic. While it shares a logical connotation with "justification," it functions as an adjective, not a noun. Therefore, it is unsuitable for directly filling a blank that requires a noun like "justification."

"Reasonable" is an adjective meaning fair and sensible. Like "rational," it does not serve as a noun and cannot directly replace "justification." While it implies sound judgment, it does not provide the substantive explanation that "justification" offers.