Round 427,685 to the nearest thousand.

A. 400,000 C. 428,000
B. 427,000 D. 430,000
the answer is C

Round 0.8394263 to the nearest hundred-thousandth.
A. 0.840 C. 0.83942
B. 0.83943 D. 0.839

would the answer be B?

Both are correct.