One tool for narrowing your topic is to list adjectives that apply towards your subject.
(And also, the process of elimination)
~Hope this helped :)
Answer: yelling, screaming
1. This sentence can mean two things:
1) A child-teaching expert is going to speak.
2) A child is teaching an expert how to speak.
2. This sentence can mean two things:
1) Dogs have faith in the Rehoming Center.
2) The name of the institution - "Dogs Trust Rehoming Center"
3. This sentence can mean two things:
1) Smoking rooms aren't available
2) Rooms in which there is no smoking are available
4. This sentence can mean two things:
1) Anadin is the fastest working medicine
2) Taking nothing instead of Anadin is the better choice
All of these sentences are ambiguous, meaning that they have at least two opposing meanings.
The answer you are looking for is C. I hope this helps and is correct. Good luck.