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【单选题】
A main idea of the article is that there are fossils that show that blind trilobites used to form lines. Which key detail from the article supports the article's main idea?A.
The scientists studied fossils. Fossils are very old remains of things that lived long ago.
B.
They studied groups of blind trilobites. Trilobites are a kind of bug-like animal.
C.
They looked similar to modern horseshoe crabs. They all died a long time ago.
D.
They are all facing in the same direction. It also looked like they are staying in contact by using their long spines.
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