Read the following sentences from the article.
"This precision landing requires perfect coordination of all its muscles. The fly’s swinging motion also needs to be calculated, which means information shoots through its body in the space of milliseconds. Not even an autopilot system controlled by a high-tech computer could carry out such a maneuver."
How do these sentences develop a key concept of the article?
by demonstrating how carefully a fly must target its landing place
by revealing the difficulty of conducting research on how a fly lands
by illustrating the complexity of the process a fly’s brain must control
by explaining how rapidly the fly’s landing occurs after it makes a loop