The IUPAC name of an unsymmetrical ether with the molecular formula ${\mathrm{C}}_4{\mathrm{H}}_{10}\mathrm{O}$

${\mathrm{C}}_4{\mathrm{H}}_{10}\mathrm{O}$ a potential structure for ether is, ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_2-{\mathrm{OCH}}_3$ . Methoxy propane is its IUPAC name.

Hence, the correct option is an option (D) Methoxy propane.