The correct answer to this open question is the following.
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The statement that best describes how Benedict Arnold's involvement in the American Revolutionary War is first introduced in the text is "The enactment of the Stamp Act spurred Arnold into protesting British taxation, trying to save his business."
We are referring to the article called<em> "Benedict Arnold: Two sides of a Bitter Coin,"</em> written by David White in 2014.
In the article, the author says that he and his family really suffered when the English crown imposed the Stamp Act in the colonies, impacting his business. He publicly rejected this taxation and then he decided to join the Sons of Liberty. He made a trip to Boston and could witness the atrocities made by the Boston troops during the Boston Massacre.