Either one could be right.1She worried a bit ____ her hair was turning grey.
A that B for
The answer is A. But I think B is right, for means because, doesn’t it?
"She worried a bit that her hair was turning grey."
She was worried because her hair was turning gray.
"She worried a bit, for her hair was turning grey."
She was worried, and the reason she was worried is that her hair was turning gray.
There is a difference between the two sentences, but it is a small one. The second sentence focuses more on the worrying. (The word for there does mean because.)
- For Teachers