In the following question, the given sentence has four parts marked as P, Q, R, and S. Choose the part of the sentence with the error and mark it as your answer. If there is no error, mark 'S' as your answer.

In 1363, mischief were caused by the (P)/ merchants called grocers, who engrossed (Q)/ all manner of merchandize vendable. (R)/ No error (S)