In the table, it shows that salt solution is the best in keeping the apples fresh. It was observed by testing the darkness of color by using the color testing template. From number 1-16.
As you can see from the table, at 0 minute every apples are+1,but for the next twenty minutes all the apples change their color except for the apples in the B beakers and it stays the same until 60 minutes. At 60 minutes A is +10,B is +2,C is +6 and D is +8(the positive sign stands for the increase of darkness of apple by using the color testing template which has 16 colors to measuring).This shows that B is the best and then C and D.