11. (10 points) In the two vertical equations below, the same letters represent the same digits, and different letters represent different digits. Therefore, the four-digit number represented by $\overline{A B C D}$ is ( )
A. 5240
B. 3624
C. 7362
D. 7564
【Solution】Solution: From the left number puzzle, we can analyze that $A$ and $C$ are adjacent, and $B$ and $D$ differ by 2. In the right number puzzle, it is clear that $\overline{\mathrm{GH}}=19$. If there is no carry from the units place to the tens place, then $F$ and $J$ would be $0$ and $4$, and $E$ and $I$ would be $8$ and $3$ or $6$ and $5$,

but neither set of solutions can satisfy the requirement of the left number puzzle that “$A$ and $C$ are adjacent, and $B$ and $D$ differ by 2”. Therefore, we know that there is a carry from the units place to the tens place, $F+J=14$, so $F$ and $J$ can only be $8$ and $6$, and $E+I=10$, so $E$ and $I$ can only be $3$ and $7$. At this point, we get $\overline{\mathrm{ABCD}}=5240$.

Therefore, the answer is: $A$.