Choose the sequence of steps that describes the best synthesis of 1-butene from ethanol:

• A

  $\text{ (i) }\mathrm{NaC}\equiv \mathrm{CH}\text{; (ii) }{\mathrm{H}}_2\text{, Lindlar }\mathrm{Pd}$

• B

  $\text{ (i) }\mathrm{NaC}\equiv \mathrm{CH}\text{; (ii) }\mathrm{Na},{\mathrm{NH}}_3$

• C

  $\text{ (i) }\mathrm{HBr}\text{, heat; (ii) }\mathrm{NaC}\equiv \mathrm{CH}\text{; (iii) }{\mathrm{H}}_2\text{, Lindlar catalyst }$

• D

  $\text{ (i) }\mathrm{HBr}\text{, heat; (ii) }\mathrm{KOC}{\left({\mathrm{CH}}_3\right)}_3,\mathrm{DMSO};\text{ (iii) }\mathrm{NaC}\equiv \mathrm{CH}\text{; (iv) }{\mathrm{H}}_2\text{, Lindlar catalyst }$