Other Astronomers Were Skeptical About Percival Lowell's Claims of Martian

Multiple Choice

Other astronomers were skeptical about Percival Lowell's claims of Martian canals because

A) it did not seem possible for his telescope to see the surface through its thick atmosphere
B) they discovered that Lowell suffered from poor vision
C) they were able to prove that Lowell's telescope was faulty
D) when they pointed their own telescopes toward Mars they couldn't see them