单选题

“The use of a poor quality oil can lead to rapid deterioration of its properties with the resultant formation of deposits in the piston crown which in turn results in a considerable reduction in heat transfer with subsequent overheating and thermal cracking” According to this sentence, we can know that the principle reason of the overheating and thermal cracking is（）

A the use of a poor quality oil

B the deterioration of its properties

C the formation of deposits

D the reduction in heat transfer ability