Question

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?
place the pH paper into a machine that reads the pH of the solution
compare the pH paper's color with the color of pH
paper from another solution

use a different testing method because the pH paper should not change colors

compare the pH paper's color with a chart of

colors and pH ranges