If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, appears to be dropping off, the cause can be （）.<br>A:open air-box drains<br>B:loss of cooling water to the diffuser<br>C:gradual fouling of the air filters<br>D:improperly timed exhaust valves

If over a period of weeks the air-box pressure of a turbo-charged, diesel engine, operating at full load, appears to be dropping off, the cause can be （）.
A:open air-box drains
B:loss of cooling water to the diffuser
C:gradual fouling of the air filters
D:improperly timed exhaust valves

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