Answer: Third Option is correct.
Step-by-step explanation:
Since we have given that
Amount for policy = $25000
If she opt for 20 year life insurance @ $2.90 per $1000.
so, her amount of premium becomes

If she opt for straight life insurance @ $15.78 per $1000,
Then, her amount of premium becomes

Difference between them is given by

Hence, Third Option is correct.