Final answer:
A family term rider is the type of rider that extends coverage of a parent's life insurance policy to include their children. It provides convertible term life insurance coverage for the insured's children, which can potentially be converted into a permanent policy.
Step-by-step explanation:
The rider that provides coverage for a child under a parent's life insurance policy is c. Family term rider. A family term rider is an addendum to a life insurance policy that extends coverage to the children of the policyholder.
This type of rider typically offers convertible term life insurance coverage for the life insured's children, which can sometimes be converted into a permanent policy without the need for further proof of insurability.