Correct Answer: Trivial

Solution : The correct choice is the fourth option .

"Crucial" means of great importance or critical. "Trivial" refers to something of little importance or value. Since "trivial" represents the opposite idea of being unimportant, it's the antonym of "crucial".

The meanings of the other options are as follows:

• Stable : Firmly established, not likely to change, or steady.
• Essential : Absolutely necessary or extremely important.
• Urgent : Requiring immediate action or attention.