Answer:
The correct answer is:
play a key role in
Step-by-step explanation:
The phrase "play a key role in" indicates the involvement of someone in doing something or the importance of something.
For example:
- Sara plays a key role in managing all the household work.
This sentence illustrates the involvement of someone (i.e. Sara) in doing something (i.e. household work)
- Education plays a key role in the elevation of literacy rate.
This sentence illustrates the importance of something (i.e. education)