a) " it was a fun trick to play on an orphan, wasn't it?" b) " you've been under arrest for 10 minutes, 'Silky' Bob" c) " you'll have to go ahead and I'll catch up with you." d) "Sister Henderson sure got some smart grandchildren"
D) "Sister Henderson sure got some smart grandchildren"
The rest of these choices are written correctly. In choice D, the grammar isn't correct but is used anyway to give the reader a better feel of how a person in a certain region might have talked.
