If x is an integer and 2.134 × 10^x is less than 21,000, what is the greatest possible value for x?  Choose the correct answer:
A) 7
B) 6
C) 5
D) 4
E) 3

Rationale: "x is an integer and 2.134 × 10 x is less than 21,000 , what is the greatest possible value for x ? for 2.134 × 10 x is less than 21,000 to remain true , the greatest number is 2,134 , which makes x = 3 e . 3"
Answer: E