Read the sentence. Henry David Thoreau, often known as the father of environmentalism wrote the book entitled Walden. Which revision should be made so that the sentence is properly punctuated?

The phrase “often known as the father of environmentalism” adds extra information about Henry David Thoreau, so it should be set off by commas. A comma is needed after “environmentalism” to close that phrase before the main verb “wrote.” The correctly punctuated sentence is: “Henry David Thoreau, often known as the father of environmentalism, wrote the book entitled Walden.”

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