Strongest reducing agent and strongest oxidising agent are respectively

We know that Cs and Li are metals and metals are the good reducing agent and they both belong to Group 2 but as we move down the group, the reductive property increases, Thus, Cs is the Strongest reducing agent amongst alkali metals.

Fluorine is an element that has high electronegativity and the highest reduction potential so more able to lose electrons, thus it is the strongest oxidising agent.

Hence, option(c) is correct.