Arrange the following molecules in the correct order of decreasing C-C bond length:
A. `C_(2)H_(4) gt C_(2)H_(2) gt C_(2)H_(6) gt C_(6)H_(6)`
B. `C_(2)H_(6) gt C_(6)H_(6)gt C_(2)H_(4) gt C_(2)H_(2)`
C. `C_(2)H_(6) gt C_(2)H_(4) gt C_(6)H_(6)gt C_(2)H_(2)`
D. `C_(2)H_(2) gt C_(6)H_(6) gt C_(2)H_(4) gt C_(2)H_(6)`