The selection of an oil from the （） depends to a great extent on the operating conditions, the design of the engine and the type of fuel to be burned.<br>A:commercially available<br>B:commercially<br>C:commercial available<br>D:commerce available

The selection of an oil from the （） depends to a great extent on the operating conditions, the design of the engine and the type of fuel to be burned.
A:commercially available
B:commercially
C:commercial available
D:commerce available

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