Solve the Problem $\mathrm { D } ( \mathrm { h } ) = 9 \mathrm { e } ^ { - 0.4 \mathrm {~h} }$

Solve the problem.
-The function $\mathrm { D } ( \mathrm { h } ) = 9 \mathrm { e } ^ { - 0.4 \mathrm {~h} }$ can be used to determine the milligrams $\mathrm { D }$ of a certain drug in a patient's bloodstream h hours after the drug has been given. How many milligrams (to two decimals) will be present after 11 hours?

A) $0.11 \mathrm { mg }$
B) $733.06 \mathrm { mg }$
C) $5.57 \mathrm { mg }$
D) $0.30 \mathrm { mg }$