Strongest reducing agent of the following is

According to the equations and data in the table above, which species is the strongest reducing agent of the following choices?

Strongest reducing agent is

The strongest reducing agent among the following is :

Strongest reducing agent among the following is:

The strongest reducing agent out of following is :

Strongest reducing agent is-

Identify the strongest and weakest reducing agents from the following list : Zn,Cu,Ag,Na,Sn .