Geometrical isomers are possoble for :
A. `CH_(3)CH_(2)-underset(NOH)underset(||)(C)-CH_(2)CH_(3)`
B. `CH_(3)CH_(2)-underset(O)underset(||)(C)-CH_(3)`
C. `CH_(3)CH_(2)-underset(NOH)underset(||)(C)-CH_(3)`
D. `C_(6)H_(5)-underset(O)underset(||)(C)-CH_(3)`