Provide your best answer for the following question. Give ONLY the answer, no other words or explanation.
For example:

Answer: <most likely answer, as short as possible; not a complete sentence, just the answer!>.

The question is: A student plans to conduct an experiment to see how quickly mice learn to navigate a maze to reach a reward at the other end. Which of these will help lead to the most accurate conclusion?
A large, open maze with multiple paths and rewards.