The correct option is
C Sterol
Gibberellin is a plant hormone. It is diterpenoids chemically. There are two pathways for the synthesis of gibberellin, mevalonic acid-dependent and mevaloni acid-independent cycle. Mevalonic acid-dependent pathway also involves synthesis of sterol. Second pathway involves synthesis of carotenoids. Farnesyl pyrophosphate in MVA pathway either forms triterpenes and sterols or forms diterpenes and gibberellin.Thus, the correct answer is a 'Sterol'.