Which expression is the LCD of these fractions?

6/5x^4y, 8/19xy^2, 12/2xy

A. 190x^6y^4

B. 190x^4y^2

C. 190x^4y

D. 190xy

To determine the LCD of the fractions, factor the denominators. Multiply the factors obtained; however multiply only once the common factors.

For the numerical coefficients: 5, 19, and 2, the least common multiple is 190. For the variables involving x: x^4, x, and x, the least common multiple is x^4. That of the variables involving y: y, y² and y is y². Thus, the answer is letter C.