When a caterpillar emerges from the egg on a tree branch, it immediately climbs upward until it finds a leaf bud to eat. Biologists thought that this behavior displayed an innate tendency to move in the direction opposite to the pull of gravity. In a recent experiment, a strong light source was placed at the bottom of a tree, and caterpillars, after hatching, climbed downward. Which of the following hypotheses is best supported by the statements given? ['Newly hatched caterpillars move toward the leaf bud nearest to them.', 'Caterpillars have an innate tendency to move in the direction of gravity.', 'Newly hatched caterpillars move towards the strongest light source in the environment.', 'Newly hatched caterpillars are unable to see in the dark.']