Concept:Some adjectives are always followed by a fixed preposition. Allergic always takes to.Solution:We say "allergic to dust", "allergic to pollen", "allergic to penicillin".So the sentence is: "Adwoa's daughter is allergic to dust."A. "about" is used with words like worried about, not allergic.B. "against" may feel right because the body reacts against dust, but English does not say "allergic against".C. "with" is not used after allergic either.Key point: The noun takes the same preposition: an allergy to dust.Answer:Option D (to)