The answer to this question is B.
The correct answer is D.
In this excerpt from "Sir Gawain and the Green Knight," we can see that everyone was scared of the skin colour of the Knight. So much that they though he might have been a ghost.
So, when the green Knight spoke, nobody could answer him, not even the noble Knights, who were petrified.
The answer is letter D (risks of secondhand smoke)
Dear Mark,
I like learning about nature. What do you like learning about?
Your Friend,
Lizzie