Answer:
Gas Pumping Station Operators → Biofuels Processing Technicians - Solar Energy Installation Managers
Explanation:
Option C is the relevant ranks from least to the greatest. As the operator is the one who learns about the operating system of the machine, then he can be able to technically evaluate any issue regarding machine. As a technician, he can be able to address the problems technically and can maintain the machine timely. Above all, Energy Installation Managers, are the one who guided operator and technician about how to address the situation.
