which of the following species would not function as an oxidizing agent mno4-, mn2+,?

Both MnO₄⁻ and Mn²⁺ ions can function as oxidizing agent. However, MnO₄⁻ ion (especially when acidified) is commonly used as oxidizing agent.

Acidified MnO₄⁻ ion is commonly used as a strong reducing agent. For example, it can oxidize oxalate ion to carbon dioxide gas.
2MnO₄⁻(aq) + 5C₂O₄²⁻(aq) + 16H⁺(aq) → 2Mn²⁺(aq) + 8H₂O(l) + 10CO₂(g)

The oxidizing power of Mn²⁺ ion is much lower than that of MnO₄⁻ ion. Mn²⁺ ion can only oxidize reactive metals in displacement reactions. For example, Mn²⁺ ion can oxidize Zn metal to Zn²⁺ ion.
Zn(s) + Mn²⁺(aq) → Mn(s) + Zn²⁺(aq)

Mn^2+ is NOT an oxidising agent.

Remember MnO4^- (Permangante) in acid solution acts as an oxidising agent , to oxidise other species
Of its self it reduces to 'Mn^2+.