The traffic lights at 3 different road crossings change after every 48 sec, 72 sec and 108 sec, respectively. If they all change simultaneously at 8:20 a.m., then at what time will they next change again simultaneously?

A

8:27:12 a.m.

B

8:33:32 a.m.

C

9:12:18 a.m.

D

8:40:14 a.m.