11. The car license plates in a certain town consist of four characters, the first of which must be a vowel $(A, E, I, O, U)$, the second and third must be different non-vowel letters, and the fourth must be a digit from $0$ to $9$. If a license plate is chosen at random from those that meet these conditions, the probability of selecting "AMC8" is ( ).
(A) $\frac{1}{22050}$
(B) $\frac{1}{21000}$
(C) $\frac{1}{10500}$
(D) $\frac{1}{2100}$
(E) $\frac{1}{1050}$
11. B.
$$
\frac{1}{5} \times \frac{1}{21} \times \frac{1}{20} \times \frac{1}{10}=\frac{1}{21000} .
$$