Concept: This question requires choosing the most appropriate verb to describe a crowd taking extrajudicial action against a "poor robber." The choice depends on the specific meaning of the verbs.
Step 1: Analyze the meaning of the options
(1) murdered: To kill (someone) unlawfully and with premeditation. While a crowd could murder someone, "murder" is a general term for unlawful killing.
(2) assassinated: To murder (an important person) for political or religious reasons. This term is specific to prominent figures and motives, not typically a "poor robber."
(3) lynched: To kill (someone), especially by hanging, for an alleged offense with or without a legal trial, typically carried out by a mob. Lynching implies extrajudicial punishment by a crowd.
(4) strung up: This can mean to hang someone, often as a form of execution or lynching. It's a more colloquial way of describing the act of hanging, which could be part of a lynching.
Step 2: Consider the context "The crowd ... the poor robber"
The context involves a "crowd" and a "robber." This suggests a mob action or vigilante justice.
"Lynched" specifically refers to a mob killing someone they believe has committed a crime, without a legal trial. This fits the scenario of a crowd taking action against a robber.
"Murdered" is too general. While lynching is a form of murder, "lynched" is more specific to the mob action.
"Assassinated" is inappropriate for a "poor robber."
"Strung up" implies hanging, which is one method of lynching, but "lynched" describes the overall act of mob justice which might or might not involve hanging.
Step 3: Identify the most fitting word
The word lynched best describes the action of a crowd taking the law into its own hands and killing an alleged criminal, like a robber. It specifically implies an extrajudicial killing by a mob.