Albert has a rectangular print that is $1$ foot in length and $8$ inches in width. He wants to reduce the dimensions of the print proportionally so that the new print has a width of $3$ inches. What should be the length of the new print?

A $2\mathrm{.}6$ in$.$

B $4\mathrm{.}5$ in$.$

C $7\mathrm{.}5$ in$.$

D $9$in$.$