Which of the following is not true of parenthetical elements?

Question

A. The information they supply is necessary for the sentence to make sense.
B. The information they supply can modify the subject or the verb.
C. They provide additional detail.
D. They require commas to set them off.

I picked A, because sometimes the added information isn't necessary for the sentence to make sense.

Am I right or wrong with my thinking?

Answer 1

You are right. :-)

Answer 2

thanks

Answer 3

You're welcome.

Answer 4

http://grammar.ccc.commnet.edu/grammar/commas.htm <~~See #4 here.

I think the answer is D AND C. What a badly written question that is.