Which sentence is punctuated correctly? a. as if on cue, one entire row of people on the subway stood up and began to dance the tango they danced off at the next stop. b. as if on cue, one entire row of people on the subway stood up and began to dance the tango, they danced off at the next stop. c. as if on cue, one entire row of people on the subway stood up and began to dance the tango; they danced off at the next stop. d. as if on cue, one entire row of people on the subway stood up and began to dance the tango and they danced off at the next stop?