Hector is investigating the inheritance pattern of leaf curling in response to
temperature. He grows 10 plants in a temperature-controlled room. He counts
the number of plants with curled leaves at each 5-degree increase in
temperature. How could Hector best increase the validity of his experiment?
A. Have someone else count the plants.
B. Increase the temperature in smaller increments.
C. Test more than 10 plants.
D. Grow control plants outside the room.