What is the best meaning of the bold face word?

The candidate for Senior Class President gave a lengthy rationale as to why she would be the best person for the position. She has at least three strong point
the bold face word is RATIONALE

In this context, the best meaning of the bold face word "rationale" is "reasoning" or "justification." It refers to the logical explanations and arguments provided by the candidate for Senior Class President to support her claim of being the best person for the position.

the answer choices are

Reason
Discussion
Slang Poem
Dramatic Interpertation

The best meaning of the bold face word "rationale" is "reason."