A hiker is walking through an apple orchard growing two varieties of apple trees - Festival and Cool Crisp. This person notices that the leaves of all the trees are curled. This person wonders, "Are all apple leaves curled?"
In order to answer the hiker's question, which of the following would be the most useful hypothesis?
A. Some apple leaves are curled and others are not.
B. Apple leaves may be curled.
C. All apple leaves are curled.
D. If a leaf is from a fruit tree, then it will be curled.