The standard reduction potentials at 298K for the following half-reactions are given against each

Zn²⁺(aq) + 2e ⇌ Zn(s); -0.762 V

Cr³⁺(aq) + 3e ⇌ Cr(s); -0.740 V

2H⁺(aq) + 2e ⇌ H₂(g); 0.00 V

Fe³⁺(aq) + e ⇌ Fe²⁺(aq); 0.770 V

Which is the strongest reducing agent?

(a) Zn (s)

(b) Cr (s)

(c) H₂(g)

(d) Fe³⁺(aq)