Oh no this is sad maybe you might wanna go and contact them or feedback theough the answer bot
Answer: D. Ways to help readers understand what they read
I hope that this helps you !
The correct answer here would be an "Adjective Phrase", aka choice "A". It is an adjective phrase because it states "of a landscape", adjectives are descriptive words and "of" here indicates more description/clarification.
Hope this helps!
~Troy