Identify A and B in the following reaction
`CH_(3)-CH_(3)overset(B)rarrCH_(3)COOHoverset(A)rarrCH_(3)CH_(2)OH`
A. `{:(A,B),(HI+redP,LiAlH_(4)):}`
B. `{:(A,B),(Ni//Delta,LiAlH_(4)):}`
C. `{:(A,B),(LiAlH_(4),HI+red P):}`
D. `{:(A,B),(Pd-BaSO_(4),Zn+HCl):}`
