In a four stroke cycle diesel engine, the compression

A)
may start and end anywhere
B)
starts at top dead centre and ends at 40° before bottom dead centre
C)
starts at 40° before top dead centre and ends at 40° after top dead centre
D)
starts at 40° after bottom dead centre and ends at 10° before top dead centre

Correct Answer : Option (D) :   starts at 40° after bottom dead centre and ends at 10° before top dead centre