Which of the questions below is scientific? O A. Are copper statues more attractive than stainless-steel statues? B. Why is copper a better electrical conductor than iron? C. How much does a kilogram of copper cost? O D. How much copper wire is used in building a house?​

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. use a different testing method because the ph paper should not change colors b. place the ph paper into a machine that reads the ph of the solution c. compare the ph paper's color with the color of ph paper from another solution d. compare the ph paper's color with a chart of colors and ph ranges