Which shows the expressions rewritten with the least common denominator? (7x-2)/4x² and (x-1)/8x
a. (28x-8)/16x² and (2x²-2x)/16x²
b. (14x-4)/8x² and (2x-2)/8x²
c. (28x²-8x)/16x³and (2x³-2x²)/16x³
d. (14x-4)/8x² and (x²-x)/8x²