
Passage: Zhu Hong: red squirrels make holes in the bark of sugar pines to absorb sap. Since the sap of sugar pine is mainly composed of water and a small amount of sugar, it is roughly certain that red squirrels are looking for water or sugar. Water is easily available in other ways where pine trees grow. Therefore, red pine trees are not trying to dig holes because they are looking for water, they may be looking for sugar. Lina: it must not be looking for sugar but something else, because the concentration of sugar in sugar pine sap is so low that red squirrels have to drink a lot of sap to get a little sugar.
Question: Zhu Hong's argument is carried out in which of the following ways?
A. A.A general law is stated, and this argument is an example of the application of this law
B. B.A larger part of the observable behavior is described
C. C.An analogy is made according to the similarity between clearly understood phenomena and unexplained phenomena
D. D.One explanation of an observed phenomenon is excluded and another possible explanation is obtained
Answer: