Answer :
option b is correct because:
exp1:(3*2)3*2=(6)3*2=18*2=32
exp2:(3*3)2(*2)=(9)2(*2)=(9)4=36
as 36>32 so exp2>exp1
exp1:(3*2)3*2=(6)3*2=18*2=32
exp2:(3*3)2(*2)=(9)2(*2)=(9)4=36
as 36>32 so exp2>exp1