Final answer:
A disability income rider prevents a policy from lapsing if the insured becomes disabled for more than six months.
Step-by-step explanation:
The rider that prevents a policy from lapsing if the insured becomes disabled for more than six months is called a disability income rider. This rider provides a portion of the insured's income if they are unable to work due to a disability. It ensures that the policy remains in effect and continues to provide coverage during the period of disability.