Based on the common root word, an activity which all three words have in common is: judging.
What is etymology?
Etymology can be defined as the study of the origin of a word and the evolution of its semantic meaning over a period of time. This ultimately implies that, etymology is mainly focused on knowing the origin of a word and how its meaning have changed throughout history.
In this scenario, the common root word for these three words judicial, prejudice, and adjudicate is "jud" and the judging of an event, idea, opinion, person, group of people, place, etc., is the activity which all three words have in common.
In this context, we can reasonably and logically deduce that these three words judicial, prejudice, and adjudicate are used for judging.
Read more on etymology here: brainly.com/question/2445047
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