Final answer:
David's auto insurance that covers the gap between his medical bills after a car accident and the limits of the responsible party's insurance is the uninsured/underinsured motorist coverage.
Step-by-step explanation:
The subject of this question pertains to auto insurance coverage types, specifically in the context of covering medical bills after a car accident. David's medical bills exceed the responsible party's insurance coverage limits. The type of coverage from David's own auto insurance that would cover the gap between his bills and the other person's coverage limits is uninsured/underinsured motorist coverage (c). This coverage is designed to protect insured drivers from financial losses when the at-fault driver's insurance is insufficient. Comprehensive coverage pertains to non-collision incidents, collision coverage applies to damages from accidents, and liability coverage protects against damages the policyholder causes to someone else. None of these directly address gaps left by another person's insufficient coverage.