Which of the following is the best dehydrating agent for `1^(@)` alcohols

Which of the following is the best dehydrating agent for `1^(@)` alcohols
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Which of the following is the best dehydrating agent for `1^(@)` alcohols A. Con `H_(2)SO_(4)` B. `CaO` C. `Al_(2)O_(3)` D. `POCl_(3)`
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