Correct Answer: Inevitable

Solution : The correct one-word substitute is the fourth option.

Inevitable describes something that is unavoidable, certain to happen, or bound to occur, often due to circumstances, natural laws, or conditions that cannot be changed or prevented.

The meanings of the other options are as follows:

• Justifiable refers to something that can be justified or explained as reasonable, fair, or morally right based on valid reasons or evidence.
• Indispensable describes something that is necessary, essential, or crucial and cannot be done without.
• Convertible refers to something that can be changed, transformed, or adapted from one form, state, or function to another.