read the sentence. henry david thoreau, often known as the father of environmentalism wrote the book…

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
Brief Explanations:
The phrase "often known as the father of environmentalism" is a non - essential appositive. Non - essential appositives should be set off by commas. Since there is a comma before the appositive, there should be one after it to properly set it off.
Answer:
add a comma after "environmentalism"