Caitlin wants to determine if a tomato plant grows better in potting soil or dirt. which of the following describes the best set up to conduct this type of investigation?

2 pots of the same size: one with 1 pound of potting soil, one with 2 pounds of dirt, 2 tomato plants of the same size and type
2 pots of different sizes: one with 2 pounds of potting soil, one with 2 pounds of dirt, 2 tomato plants of the same size and type
2 pots of the same size: one with 2 pounds of potting soil, one with 2 pounds of dirt, 2 tomato plants of the same size and type
2 pots of the same size: one with 2 pounds of potting soil, one with 2 pounds of dirt, 2 tomato plants of different sizes and the same type