When concentrated ${H_2SO_4}$ reacts with $X$ at a temperature of $160-170 \, ^\circ C$,ethylene is obtained. What is $X$?
- A${C_2H_5OH}$
- B${CH_3OH}$
- C${C_3H_7OH}$
- D${(CH_3)_2CH-CH_2OH}$
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