Ethanol is converted into ethoxy ethane `,`
A. by treating with conc. `H_(2)SO_(40` at room temperature
B. by heating ethanol with excess of conc. `H_(2)SO_(4)` at 443 K
C. by heating excess of ethanol with conc. `H_(2)SO_(4)` at `140^(@)C`
D. by heating with conc. `H_(2)SO_(4)` at 273K
