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By which process does the knocking starts in diesel engine?

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By which process does the knocking starts in diesel engine?

(a) Due to sudden spontaneous combustion of last portion of fuel

(b) Due to delay in spontaneous combustion of last portion of fuel

(c) Due to the rise in temperature of diesel engine

(d) Due to the parts of diesel engine

This question was posed to me by my school principal while I was bunking the class.

My query is from Octane and Cetane Number topic in portion Fuels and Combustion of Engineering Chemistry II

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The correct option is (b) Due to delay in spontaneous combustion of last portion of fuel

Easiest explanation: Due to the presence of impurities in diesel, its spontaneous combustion of the last portion of fuel takes some time. Due to this their produces an uneven sound in the engine which is called knocking.

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