You want the knot to be loose enough that you can untie it later on.

Honestly, you wanna tie the knot as tight as you can so it doesn't come loose, for example with fishing line, you don't want to loose your lure, so tie it tight. The only thing I would disagree with this, is on shoes, I want to be able to get my lases undone.

it is the nurture that decides the behavior of a child.

explanation:

naturally, children are pure. it is an environment and the type of attention a child gets that determines their behavior.  

your answer is b. "with strong wording encouraging readers to take action."