Assume $L_1$ and $L_2$ are regular languages defined over the alphabet $=\{ab\}.$ Which one of the following options concerning statements $A,B,$ and $C$ is correct?

Statement $A$:$L_1^{***}$ is regular.

Statement B: $L_1\text{'}$ is not necessarily regular.

Statement $C$:$L_1{L}_2$ is regular.

Statement $A$ is false.

Statement $B$ is false.

Statement $C$ is false.

All the statements are true.