Sentence Correction - Verbal and Reasoning

Directions to SolveWhich of phrases given below each sentence should replace the phrase printed inboldtype to make the grammatically correct? If the sentence is correct as it is, mark 'E' as the answer.
Q1:

We demonstrated to them how we were prepared the artistic patterns.

A are prepared

B have prepared

C are preparing

D had prepared

E No correction required

ANS:D - had prepared

No answer description is available.