Pleas help me, i'm not sure which one it is and i think it is 10 students got off the bus every minute, please let me know if i'm wrong.

Pleas help me im not sure which one it is and i think it is 10 students got off the bus every minute please let me know if im wrong class=
Pleas help me im not sure which one it is and i think it is 10 students got off the bus every minute please let me know if im wrong class=