Choose your answer?

Dominic placed a caterpillar in a container with different kinds of leaves. Which information should he record to find out what food this caterpillar eats?

Options are: (I) the type of leaves the caterpillar has eaten (II) the amount of time for all the leaves to be eaten (III) the number of leaves that were put in the container (IV) the number of minutes the caterpillar spends eating
(I)