If there are 135 hydrogen bonds between two strands of a fragment of DNA double helix which contains 23 Guanine nitrogen basis, what is its total length ?

Question

$\begin {array} {1 1} (1)\;19.04\: A & \quad (2)\;190.4\: A \\ (3)\;1904\: A & \quad (4)\;190.4\: nm \end {array}$