Answer:
C. The insurer will deny J's request to add more insurance.
Explanation:
The Guaranteed Insurability Rider means extra policy which is an addition to insurance rider policy and allows the purchaser of the policy to purchase extra life insurance on the life of the insured at prearranged periods of time.
Usually, this ability to purchase extra life insurance ends at the age of 40 and since the J has just celebrated the 42nd birthday, therefore he will not be eligible to buy more death benefit.
Based on the above discussion, the answer shall be C. The insurer will deny J's request to add more insurance.