Question

blueline furnaces: warranty policy
equipment and initial installation
if a blueline furnace has any issues within one calendar year of installation, blueline furnaces will send a service technician to repair the furnace. if the furnace cannot be repaired, blueline furnaces will install a new furnace. these services will be done at no cost to the customer.
repairs
for the life of the furnace, blueline furnaces guarantees the quality of all repairs for 30 days. if a furnace breaks down as a result of a previously fixed issue, blueline furnaces will send a technician to fix the issue at no additional charge.
annual safety inspection
purchase of this policy includes an annual safety inspection. the customer must schedule the safety inspection with blueline. the inspection must occur once
you work for blueline furnaces as a service technician. according to the policy, a service technician is someone who:
○ sells furnaces.
○ builds furnaces.
○ repairs furnaces.
○ inspects furnaces.
○ destroys furnaces.

Explanation:

From the "Equipment and Initial Installation" section, it says Blueline Furnaces will send a service technician to repair the furnace if there are issues. Also, in the "Repairs" section, technicians are sent to fix issues. So a service technician's role here is to repair furnaces. Selling, building, destroying are not mentioned as their role, and inspection is part of a separate annual safety inspection (not the main role of the service tech as per the policy details given for service tech in repair contexts).

Answer:

C. repairs furnaces.