To shovel all of the snow on his driveway, Kevin needs 12 hours. Individually, Dave needs 8 hours to shovel all of Kevin’s snow, John needs 6 hours to shovel all of Kevin’s snow, and Allison needs 4 hours to shovel all of Kevin’s snow. If Kevin, Dave, John, and Allison all work together, how many minutes do they need to shovel all of Kevin’s snow?
Answer Choices
A. 108
B. 120
C. 84
D. 96
E. 90