The specific output per kg mass flow rate of a gas turbine (having fixed efficiencies of compressor and turbine and fixed higher and lower temperature) with increase in pressure ratio will

A. Increase first at fast rate and then slow

B. Increase first at slow rate and then fast

C. Decrease continuously

D. First increase, reach maximum and then decrease

Please do not use chat terms. Example: avoid using "grt" instead of "great".

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