Two `C_(4)H_(6)` isomers give the same `C_(4)H_(8)O` product with `HgSO_(4)` and dil. `H_(2)SO_(4)`. However these isomers give different `C_(4)H_(6)Br_(4)` products with excess bromine. What are these isomeric hydrocarbons?
A. Cyclobutene and 1-butyne
B. 1,2-butandiene and 1,3-butadiene
C. 2-butyne and cyclobutene
D. 2-butyne and 1-butyne