B - too specific for the purpose
While that would be a good topic sentence, it is far too specific for the thesis of an entire essay
The correct answer is letter C: a complete subject.
The correct explanation would be that it is formed by the simple subject (the vertical farm) and a modifier which describes the simple subject (dubbed "The Dragonfly").
In order to identify a complete subject, you have to ask yourself who or what do the action: What is a remarkable building?
The answer is: The vertical farm dubbed "The Dragonfly" (complete subject)
I’m with the first person I think it’s true
The answer for this would be “B”
your answer is Both A & B