The answer is B.
You can find this answer by using the rule that if you are dividing two fractions by each other, you can flip the second one and then multiply straight across. So in this case, your numerator would be the top of the first one multiplied by the bottom of the second one.
x * 2x = 2x^2
And the denominator would be the bottom of the first one multiplied by the top of the second one.
(3x - 1)(x - 2) = 3x^2 - 7x + 2