Which of the following redox reactions do you expect to occur spontaneously in the forward direction?show your reasoning. A. Ni(s)+Zn2+(aq)?Ni2+(aq)+Zn(s) B. Ni(s)+Pb2+(aq)?Ni2+(aq)+Pb(s) C. Pb(s)+Mn2+(aq)?Pb2+(aq)+Mn(s) D. Al(s)+3Ag+(aq)?Al3+(aq)+3Ag(s)