Answer
Lithium and Sodium are expected to be good reducing agents based on periodic trends.
Work Step by Step
Reducing agents are those substances that help other substances to become reduced in a redox reaction. That means reducing agents are oxidized in a reaction by losing electrons so that the other substance can gain the electron and become reduced.
Here, Lithium and Sodium (group 1 element in the periodic table) both are metals in nature. Metals have the tendencies to lose electron and become oxidized. So, they are good reducing agents.
