Identifying Functional Groups in Organic Chemistry

In organic chemistry, functional groups play a crucial role in determining the chemical reactivity and properties of a molecule. Consider the following compound with the molecular formula C₄H₈O, which contains a carbonyl group (C=O) as part of its structure. This compound shows the characteristic behavior of a ketone when subjected to common reactions such as nucleophilic addition. Identify the functional group present in the compound and select the correct answer that identifies its type based on the options below.