Correct Answer: dismissal

Solution : The correct choice is the third option.

Explanation:
The reason "dismissal" is the most appropriate synonym for "denial" is because both terms involve rejecting or refusing something. Dismissal captures the sense of refusing or rejecting in a way that fits the context of the sentence.
The meanings of the other options are as follows:

• Permission: The act of allowing or granting consent.
• Sanction: Official permission or approval.
• Approval: The act of agreeing to or accepting something.

Therefore, the correct answer is dismissal.