Hello there!
This would be an example of a(n) idiom.
Saying something "costs an arm and a leg" could mean something is very pricey, or exspensive.
Hope this helps!
~DL
The example is B. sentence fragment
Answer:
B
Explanation:
The topic is the debate between online and in-person education, and B introduces this, which will be the subject of the rest of the essay / article
Answer: It should be about a girl walking around the forest! Discovering new things.
Explanation: