Which answer explains why there isn’t a hyphen between well and behaved in the following sentence?

Question

The students were so well behaved that Ms. Irvin dismissed them early.
(1 point)

The words well and behaved don’t end in -ly.
The words well and behaved are on the same line.
The words well and behaved follow the word they modify.
The words well and behaved are compound words.

My Answer:
1)B

Is it correct or no?

Answer 1

"on the same line"?? What in the world does that mean?

Make sure you are clear on what type of word each one is. Then re-think your answer.

Answer 2

My, this is an obscure rule to be teaching middle-school kids!

The correct answer is C. However, not all editors and grammarians agree.

http://grammar.ccc.commnet.edu/grammar/grammarlogs3/grammarlogs439.htm

Answer 3

Thx Ms. Sue I was confused with the question to, mainly because well...many different have different opinions but also a hyphin can be used in many ways.

Answer 4

It doesn't need a hyphen because "well" is an adverb which modifies the adjective (participle) "behaved" -- a hyphen here would be superfluous!

Answer 5

The website also says the hyphen is unnecessary when it follows the modified word.