During a laboratory session, students were tasked with identifying different organic compounds based on their molecular structures. One compound, called 2-pentanol, has the molecular formula C₅H₁₂O. The students also learned that 2-pentanol is classified as an alcohol due to the presence of a hydroxyl (-OH) functional group. Understanding functional groups is crucial in organic chemistry because they determine the chemical properties and reactivities of organic compounds.

Based on your knowledge of functional groups, which of the following options correctly identifies the functional group present in 2-pentanol?