In which of the following half cells, electrochemical reaction is pH dependent?

In 3d series, the metal having the highest M²⁺/M standard electrode potential is :

The $${\left( {{{\partial E} \over {\partial T}}} \right)_P}$$ of different types of half cells are as follows:

(Where E is the electromotive force)

Which of the above half cells would be preferred to be used as reference electrode?

The correct order of reduction potentials of the following pairs is

A. Cl₂/Cl^$$-$$

B. I²/I^$$-$$

C. Ag⁺/Ag

D. Na⁺/Na

E. Li⁺/Li

Choose the correct answer from the options given below.