"Three boxes in a line connected by arrows. Box 1 is labeled A muckraker conducted an investigation and wrote an arcticle....". The phrase best fits in the last box is "The public began to take action by setting up committees and supporting reform candidates". . This is further explained below.
<h3>What is the investigation?</h3>
Generally, the investigation is simply defined as Research that follows a set protocol or methodology.
In conclusion, investigation = the process of doing a formal or methodical study of a subject.
Read more about an investigation
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