Jenny places a strip of ph paper into a solution. when she removes the ph paper, it has turned yellow-green. what should jenny do next to determine the ph of her solution? a. place the ph paper into a machine that reads the ph of the solution b. compare the ph paper's color with the color of ph paper from another solution c. use a different testing method because the ph paper should not change colors d. compare the ph paper's color with a chart of colors and ph ranges