The correct answer is: B) It would help the reader visualize the complex parts described in the text.
This excerpt seems like a mere description, it is difficult to form a mental image of the thing they are describing as they are using complex words. An image would help the reader undestand what they are talking about. The word visualize implies forming a mental image so it fits.
As I said, it looks like a description so you don't need to assemble or operate anything, it would be needed if this was an operation manual.
To pronounce the complex words the best option is a dictionary, not an image.
