The correct answer is C) A requirement for more energy to achieve adequate compression. On a gas turbine engine, a high outside air temperature can cause a high turbine inlet temperature and low mass/weight of airflow through the turbine. This results in a requirement for more energy to achieve adequate compression within the engine. Cooler air has a higher density, which allows the engine to achieve the necessary compression with less energy input. Conversely, hotter air has a lower density, requiring more energy to compress it sufficiently for efficient engine operation. The other answer choices are incorrect because: A) Less energy would be required to achieve adequate compression with cooler, denser air. B) Hotter exhaust gas temperature is more likely with a high outside air temperature, not cooler. D) There is a specific condition that occurs with high outside air temperature on a gas turbine engine.