Final answer:
Option C). The purpose of this is to improve the cycle efficiency of a gas turbine by recovering some of the heat that would otherwise pass to waste with the exhaust gases is the regenerator. The regenerator in a gas turbine is a heat exchanger that transfers heat from the hot exhaust gases to the compressed air entering the combustion chamber.
Step-by-step explanation:
By recovering some of the heat that would otherwise go to waste with the exhaust gases in the regenerator, this is done to increase the cycle efficiency of a gas turbine. Heat is exchanged from the hot exhaust gases to the compressed air entering the combustion chamber by the regenerator in a gas turbine. By doing this, the air is preheated, raising its temperature and enhancing combustion efficiency.