AMC 12 2003b Problem 6

The second and fourth terms of a geometric sequence are 2 and 6. Which of the following is a possible first term?

$\text {(A) } -\sqrt{3} \text {(B) } \frac{-2\sqrt{3}}{3} \text {(C) } \frac{-\sqrt{3}}{3} \text {(D) } \sqrt{3} \text {(E) } 3$