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B
group IIA
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C
group IIIA
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D
group VIA
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E
group VIIA
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Solution
The correct option is C group IA Reducing agent is the one that undergoes oxidation and oxidation means loss of electrons.
Group I elements have only one electron in their outer shell. As a result, fastest way for them to obtain a full outer shell is to simply lose an electron. Therefore, during a chemical reaction, these elements often act as "Reducing agents" and donate an electron to other reactants in order to obtain a full outer shell.