Answer: b. to put an end to
Explanation: When something is abolished, it is completely eliminated or terminated. For example, if a law is abolished, it means that the law is no longer in effect and has been completely done away with.
It is important to note that "abolish" is different from "end temporarily" (option c) or "compromise" (option a). When something is abolished, it is permanently removed or stopped, whereas when something ends temporarily, it means that it is paused or halted for a certain period of time but may resume later. "To negotiate" (option d) means to discuss or bargain with others in order to reach an agreement, which is not the same as abolishing something.