Correct Answer: Grew

Solution : The fourth option is the correct answer.

The verb wane means to decrease in vigour or become smaller.

Here, are the meanings of the options:

• Declined means decreased or became lower in value, quantity, or quality.
• Dimmed denotes a reduction in brightness or intensity, typically regarding light.
• Abated denotes lessened or decreased intensity, often referring to the reduction of a problem.
• Grew denotes an increase in size, number, or intensity, indicating growth or expansion.

Hence, the correct answer is grew.