一个圆锥形沙堆高1.5米，底面周长是18.84米，每立方米沙约重1.7吨，这堆沙约重多少吨？

—We can have a rest after finishing the work. 

—_____. We have many other things to do next.        [ ]

A. That's right                  

B. Good idea

C. I don't think so                

D. I agree with you