Final answer:
The sections in the index that would be most helpful for finding the cause of and dealing with a system malfunction are Tech Support, FAQs, Service Centers, and Error Codes.
Step-by-step explanation:
In order to find the cause of and deal with a system malfunction, you would want to look for sections in the index that provide troubleshooting steps, causes, solutions, maintenance tips, tech support, FAQs, error codes, and service centers. The sections that would be most helpful for this purpose are c) Tech Support, FAQs, Service Centers, and Error Codes.