Question

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?

place a dash after “environmentalism”
remove the comma after “Thoreau”
place parentheses around “entitled Walden”
add a comma after “environmentalism”

Answer 1

add a comma after “environmentalism”

Explanation: "often known as the father of environmentalism" is a parenthetical/nonessential phrase and should be set off with commas on both sides: Henry David Thoreau, often known as the father of environmentalism, wrote the book entitled Walden.