Correct Answer: Unequivocal

Solution : The third option is the correct answer.

Ambivalent means having mixed feelings or contradictory attitudes towards something. The antonym unequivocal means leaving no doubt, being clear, or having a singular, definite meaning.

The meanings of other options are as follows:

• Unpredictable: Not following a pattern or being difficult to foresee.
• Legitimate: Conforming to the law or rules; valid.
• Irresistible: Too attractive or appealing to be resisted.

Therefore, the correct answer is unequivocal.