Explanation:

- Option 1 - Make up: This phrase is typically used in the context of creating or inventing something, like making up a story or reconciling after an argument. It doesn't fit well with the context of the sentence.

- Option 2 - Give in: This phrase means to yield under pressure or difficulty. It is appropriate here as it implies succumbing to the idea of suicide, fitting appropriately with the sentence.

- Option 3 - Conceive on: This is not a standard phrase in English. "Conceive" means to form an idea or plan, but "conceive on" is not a common collocation, making it unsuitable for the blank.

- Option 4 - Fall in: This usually indicates physically falling into something or starting to participate. It doesn't work well for describing a response to stress or hardship in this context.