Question

The u.s has sent unmanned spacecrafts to ___ the planets in our solar system

a. all
b. none of
c. some
d. most

(its not c nor d)

Answer 1

I think the answer is A.

Answer 2

I think it's C. if we're talking about a rover.

But if it's a rocket that's computerized and automatic (synonym of unmanned)... Then it's B.