(A) to jazz up → means to make something more interesting, lively, or exciting → matches with (IV)
(B) scale back → means to reduce or make production/spending smaller in size, extent or amount → matches with (II)
(C) allude to → means to mention or refer to something indirectly without stating it explicitly → matches with (I)
(D) call upon → means to ask or request someone to do something, or to formally invite someone to speak/act → matches with (III)
Hence, Option 3: (A) - (IV), (B) - (II), (C) - (I), (D) - (III) → This correctly pairs all phrasal verbs with their appropriate meanings: jazz up enhances excitement, scale back reduces size, allude to refers indirectly, and call upon requests action → correct