Which sentence from the article would be MOST important to include in a summary of the article?

(A) An MIT-led citizen science project involving 120,000 online gamers has already helped in understanding how the brain sees movement by mapping these connections through a project called EyeWire.

(B) It turns out that inside your skeleton lives a network that is almost as complex as the neural network of
your brain.

(C) When we added together the length of these little cell fingers, imagining them being placed end to end, we found that this network is about 108,000 miles long.

(D) So to measure this proxy tunnel network and the cell network within, we resorted to a mathematical model of dendritic finger branching.