Select the structure with correct numbering in the chain `:`
A. `Coverset(5)(H)_(2)=Coverset(4)(H)-Coverset(3)(H)_(2)-overset(2)(C)-=overset(1)(C)H`
B. `overset(1)(C)H_(3)-overset(2)(C)H=overset(3)(C)H-overset(4)(C)H_(2)-overset(5)(C)-=overset(6)(C)H`
C. `Coverset(7)(H)_(2)=Coverset(6)(H)-Coverset(5)(H)=overset(4)(C)H-overset(3)(C)H_(2)-overset(2)(C)H=overset(1)(C)H_(2)`
D. `Coverset(1)(H)_(2)=overset(2)(C)H-overset(3)(C)H=overset(4)(C)H-overset(5)(C)H_(2)-overset(6)(C)=overset(7)(C)H`
