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Choose the true statement about the following compounds.

(A) All of these structures are constitutional isomers of each other.

(B) None of these structures are constitutional isomers of each other.

(C) Only structures 1 and 3 are constitutional isomers.

(D) Only structures 1 and 2 are constitutional isomers.

(E) Only structures 2 and 3 are constitutional isomers.