Which answer choice is a sentence fragment? a) even though the day was extremely cold, the professional fisherman was able to catch three large bass. b) the people gathered together under the town's famous oak tree at a memorial service for the town founder. c) whether or not the principal will change her mind and relent enforcing punishment for the school vandals. d) sarah had not slept in 28 hours due to her massive procrastination over her different class project deadlines.