Option $A$ is true since $-1$ is greater than $-2$ (both are signed here)
Option $B$ is true since $-1$ unsigned is the largest number in unsigned (all ones in binary), therefore, it is greater than any other integer possible. Although here $-2$ will be treated as the unsigned but final result will be true.
Option $C$ is true since $-1$ will be treated as an unsigned number because of $0U$. And we know that $-1$ as unsigned is the largest integer.
Option $D$ is false. This is signed comparision.
