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There is one sodium atom present, one oxygen atom present and one hydrogen atom present.

Therefore, there are a total of 3 atoms in this compound meaning your answer is option C.

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Here is your answer

C.3

REASON:

There are three atoms in NaOH

namely

1 atom of Sodium(Na)

1 atom of Oxygen

1 atom of Hydrogen

So, a total of three atoms

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