248. Why do most temperature control valves in diesel engine closed freshwater cooling systems vary the flow of jacket water through the cooler instead of through the engine?

A. Changing the rate of flow in the jackets could cause localized hot spots.
B. Emergency hand control would not be possible if water flow through the jackets were controlled.
C. Excessive cooling would take place in the heat exchangers at high loads.
D. Excessive cavitation erosion would take place in the coolers.