Teacher:You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
Teacher: Now, understand the problem? Solve this instance: A student wants to perform an experiment to determine what temperature is best for growing tomato plants. Which is the best piece of equipment to use in this experiment to measure the independent variable?
(A) rain gauge (B) light meter (C) tape measure (D) thermometer
Student:
D