When a base combine with metal it forms metal salt/base and releases:

oxygen

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hydrogen

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carbon dioxide

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nitrogen

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Solution

The correct option is B hydrogen
Metals mostly do not react with bases. However, there some metals that will react with strong bases like $N a O H$ and produce metal salt/base and release hydrogen gas. The presence of hydrogen gas can be examined by the pop sound.

Zinc reacts with dilute $N a O H$ as follows:

$Z n$ + $2 N a O H \to$ $H_{2}$ + $N a_{2} Z n O_{2}$
Option B is correct.

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