Below a sentence is given which is divided into 4 segments. Identify the segment of the sentence which contains the grammatical error. If there is no error, mark 'No error' as your answer.

The participants of the international car racing for double-seater (A) were races around the track with their souped-up cars,(B) drumming around the circuit at (C) breakneck speeds caused a lot of excitement among the crowds.(D)