(B) The bond length decreases as the bond order increases. The bond lengths are: $C-C$ (single bond) = $1.54 \ \mathring{A}$ $C=C$ (double bond) = $1.

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(B) The bond length decreases as the bond order increases. The bond lengths are: $C-C$ (single bond) = $1.54 \ \mathring{A}$ $C=C$ (double bond) = $1.34 \ \mathring{A}$ $C\equiv C$ (triple bond) = $1.20 \ \mathring{A}$ Therefore,the correct order of increasing bond length is $C\equiv C < C=C < C-C$.