iF r=2³·5²·7 AnD s=2²·3²·5, whiCh oF thE Following is EquAl to thE grEAtEst Common Divisor oF r AnD s
A．2·5
B．2²·5
C．2³·5²
D．2·3·5·7
E．2³·3²·5²·7