Correct Answer: Fluctuating

Solution : The correct option is the third option.

Wavering means to hesitate or be indecisive, often showing inconsistency in opinions or actions.
Fluctuating also denotes inconsistency or changes, especially in a pattern, indicating variations or shifts from one state to another. This aligns closely with the idea of wavering, as it shows inconsistency or change.

The meanings of the other options are as follows:

• Sickly means associated with being unhealthy or feeble, often due to illness or a sickly appearance.
• Drenching means soaking something completely in a liquid, like drenching clothes in water.
• Unconvincing means lacking persuasiveness or failing to provide sufficient evidence or reasoning to persuade someone.

Therefore, the correct answer is fluctuating.