4. What is the MAIN reason the author includes the section “We Know We're Still Missing Something”?
A. to show that scientists still have a lot to learn about sunspots even though they were observed 400 years ago
B. to show that everything Johannes Fabricius observed about sunspots was somewhat inaccurate
C. to show that scientists today have access to technology that allows them to make meaningful discoveries
D. to show that scientists are no longer prioritizing the intensive study of sunspots