Correct Answer: (a) shrivel
Solution:Grow: become larger or greater over a period of time; increase.
- (of a living thing) undergo natural development by increasing in size and changing physically.
Shrivel: wrinkle and contract or cause to wrinkle and contract, especially due to loss of moisture.
Stretch: To stretch is to extend or lengthen something beyond the normal length.
Spread: open out (something) so as to extend its surface area, width, or length.
Enlarge: make or become larger or more extensive.
Here, 'shrivel' is thus the opposite in meaning with the given word 'Grow'.