A
M
E
C
Answer is Right!
Answer is Wrong!
The missing character is $\boxed{\text{E}}$.
The sequence is a simple alternating repetition of the letters $\text{A}$, $\text{B}$, $\text{C}$, and $\text{D}$. The first letter is $\text{A}$, the second letter is $\text{B}$, the third letter is $\text{C}$, and the fourth letter is $\text{D}$. The fifth letter is $\text{A}$, the sixth letter is $\text{B}$, and so on.
The missing letter is the letter that comes after $\text{D}$ in the sequence. The letter that comes after $\text{D}$ is $\text{E}$.