When i arrived home a last night i found b that my parents c were already sleeping d no error e ........

English ( Master) Tenses

Directions : In these questions , read each sentence to find out whether there is any error in it. The error, if any, will be in one part of the sentences .The number of that part is the answer, if there is no error, the answer is (E). (Ignore errors of Punctuation, if any.)

When i arrived home/(a) last night i found/(b) that my parents/(c) were already sleeping./(d) no error/(e)