6. Sally wants to test how the type of light affects the height of bean plants. She uses three different types of light bulbs: LED, incandescent, and CFL. She exposes the plants to the lights for thesame amount of time and plants the
seeds in containers that are the same size, with the same type of soil, and waters them with the same amount of
water each day. She measures the height of the plants using a ruler and records the growth each day. Which of the
following is/are controls in the experiment?