(a) Iam senior / (b) than him (c ) by two years. / (d) No error.

This document has signed by two persons (a) This document (b) has signed (c) by two persons (d) No error

Read each sentence to find out whether there is any error in it. The error, if any, will be in one part of the sentence. The letter of that part is the answer, if there in no error, the answer is ( d ). (a) When I shall see him. /(b) I wiII tell him that/ (c ) what he has done is wrong./ (d) No error.