213,000 can be rewritten as 2.13*10^5. This tells us that it has has 3 significant digits.
Your correct answer is b. It has three significant figures.
A. Astronomers predicted eclipses and developed a 365-day calendar.
(CORRECT)
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B. The city of Machu Picchu was probably a retreat for nobility.
(INCORRECT)
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C. Scribes painted books and kept records of taxes and territories conquered.
(INCORRECT)
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D. Emperors communicated using runners from the capital city of Cuzco.
(CORRECT)
The answer is B because I just took the test hope I helped ;)
The court ruled because judicial review? The 3 branches, they all check each other
