Which of these sentences is missing punctuation? a. shalini and andrei, best friends since middle school, were suddenly and strangely drifting apart. b. after what felt like centuries andrea came back to the room and vanished behind the curtains. c. the lush green farmland stretched on for miles as marybeth drove through southern california. d. "i cannot bear to see you hurt," bjorn said as he got up from the couch and grabbed a kleenex.