When ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}$, ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}$ and ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{6}}}$ are arranged in order of increasing carbon-carbon bond strength (weakest bond first), what is the correct order?

A.     ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}{\text{, }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}{\text{, }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{6}}}$

B.     ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}{\text{, }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{6}}}{\text{, }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}$

C.     ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{6}}}{\text{, }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}{\text{, }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}$

D.     ${{\text{C}}_{\text{2}}}{{\text{H}}_{\text{6}}}{\text{, }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{2}}}{\text{, }}{{\text{C}}_{\text{2}}}{{\text{H}}_{\text{4}}}$

C