If an engine has a compression ratio of 7: 1,a. the air-and-fuel mixture in the cylinder is squeezed into a space that's seven times smaller during the compression stageb. the air-and-fuel mixture in the cylinder is squeezed into a space that's seven times larger during the compression stagec. the engine produces seven times more horsepower than it does torqued. the engine produces seven times more torque than it does horsepower

A.

Explanation:

Compression ratio of an engine is defined as the ratio of the volume of gas in cylinder when the position is at TDC ( top dead center ) means top of its stroke to the volume of the gas when piston is at the bottom which is BDC or bottom dead center.

So if an engine has a compression ratio of 7 :  1 then it means the air and fuel mixture in the cylinder is squeezed into a space that is seven times smaller during the compression stage.

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the part of the wave he is travelling on is the crest