Correct Answer: Option C

Explanation

The reactivity series of metals, also known as the activity series, refers to the arrangement of metals in the descending order of their reactivities.

Na > Ca > Mg > Al > Zn > Fe > Sn > Pb > Cu > Ag.

Considering metallic property which increases down the group, barium will be ranked calcium  

There is an explanation video available below.

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