A

\[\frac{\sqrt{12} + \sqrt{18} - \sqrt{30}}{12}\]

B

\[\frac{\sqrt{15} + \sqrt{18} - \sqrt{30}}{18}\]

C

\[\frac{\sqrt{15} - \sqrt{18} + \sqrt{30}}{12}\]

D

\[\frac{\sqrt{15} - \sqrt{18} + \sqrt{30}}{18}\]

E

\[\frac{\sqrt{12} + \sqrt{15} - \sqrt{30}}{12}\]