Answer:
the Author plans it out
Explanation:
they do this so they dont mess up
I'd go with A or C. Definitely not B or D.
B.
because its at your pace when its most convinient 4 u.
Answer:
The word "protracted" means lasting longer than expected, or unusually long, so what protracted most clearly means based on the context of the excerpt is how the time period of celestial motion studies must have lasted unusually long.
