Correct Answer: Approval

Solution : The first option is the correct answer.

"Repeal" refers to the act of revoking or annulling a law or decision. On the other hand, "approval" involves the acceptance or agreement with a law or decision, representing the opposite action.

The meanings of the other options are as follows:

• Expense is the cost or charge incurred for a service or product.
• Separation is the act of moving, being apart, or being isolated.
• Adversity means difficulties and misfortune.

Therefore, the correct answer is approval.