For a certain positive integer n less than 1000 , the decimal equivalent of \dfrac{1}{n} is 0 . \overline{a b c d e f}, a repeating decimal of period 6 , and the decimal equivalent of \dfrac{1}{n+6} is 0 . \overline{w x y z}, a repeating decimal of period 4 . In which interval does n lie?
Answer Choices
A. [1,200]
B. [201,400]
C. [401,600]
D. [601,800]
E. [801,999]