Answer :
Choice B is the answer because:
2*2=4
4*2=8
8*2=16
16*2=32
32*2=64
or
2^6= 64
2*2=4
4*2=8
8*2=16
16*2=32
32*2=64
or
2^6= 64
The answer is B... You can multiply 2*2*2*2*2*2, or you can do [tex] 2^{6} [/tex] which ever way is easier to you.