His house looks very large and beautiful. It is ____ house

Question

A. a seven-rooms   B. a seven-room   C. seven room   D. seven rooms

Answer 1

His house looks very large and beautiful. It is a seven-rooms house

Answer 2

A. a seven-rooms   B. a seven-room   C. seven room   D. seven rooms

Answer 3

A. a seven-rooms 

 B. a seven-room   

C. seven room   

D. seven rooms