A group of similar or different atoms linked together makes the molecules. The molecule given is methanoic acid. Thus, option A is correct.
Methanoic acid is a compound that has carboxylic acid as the functional group. It is the simplest carboxylic acid that has the formula HCOOH. As the molecule has a COOH group it will be acid.
The molecule can not be an aldehyde as it lacks the R−CH=O group, it cannot be alcohol as it lacks the OH group, and neither it can be methylamine as it lacks the nitrogen group.
Therefore, option A. methanoic acid is correct.
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