How Many Structural Isomers (Also Called Constitutional Isomers) Are There

How many structural isomers (also called constitutional isomers) are there for butene, and why?

A) two, because of resonance
B) two, because of geometrical isomerism and two of the structures can be superimposed
C) two, because the double bond can be in either one of two locations
D) three, because of geometrical isomerism and the double bond can be in different locations
E) three, because of resonance and the double bond can be in different locations

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