Step 1: Understanding the Concept
The question asks for the legal term for the release of a convicted prisoner from jail before their sentence is complete, subject to certain conditions.
Step 2: Defining the Legal Terms
(A) Discharge: This can mean a person is let go by the police without charges, or by a court before framing charges if there is insufficient evidence. It happens at a very early stage.
(B) Parole: This is the conditional, temporary release of a convicted prisoner who has already served part of their sentence. The release is subject to good behavior and other conditions, and the prisoner remains under supervision. If conditions are violated, they can be sent back to prison. This perfectly matches the question's description.
(C) Bail: This is the conditional release of an accused person who is awaiting trial or an appeal. It is granted to ensure their presence in court when required. It is for under-trials, not convicted prisoners serving a sentence.
(D) Acquittal: This is a final judgment by a court that a person is not guilty of the crime they were charged with. It means they are found innocent and are released permanently and unconditionally.
Step 3: Final Answer
The conditional release of a prisoner (a convicted person) is known as parole. Therefore, option (B) is the correct answer.