Ann, bob, and charlie are testing to see if putting sugar in water helps flowers last longer. They buy six roses and place three in containers with plain water and three in containers with sugar water. They record the time before the first petal falls off. The ones in the sugar water lasted slightly longer than those in plain water. Before including that adding sugar to the water does not have a significant affect on how long flowers will last, what should they do?
A) use warm water in each container
B) run more trials for the experiment
C) try salt in the water instead of sugar
D) try different amounts of water in the containers