(C) In the structure of $B-DNA$,the helix makes a complete turn every $3.4 \ nm$ (or $34 \ \mathring{A}$). Each turn consists of $10$ base pairs. The

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(C) In the structure of $B-DNA$,the helix makes a complete turn every $3.4 \ nm$ (or $34 \ \mathring{A}$). Each turn consists of $10$ base pairs. The distance between two adjacent base pairs is $0.34 \ nm$ (or $3.4 \ \mathring{A}$). Therefore,the length of one full turn is $10 \times 0.34 \ nm = 3.4 \ nm$.