Answer:
Reject some alternative hypothesis.
C) would be the answer. I just did a test w/ this question and I picked C) and got !00%
I believe it's D don't take my word for it.
The flagella of the eukaryotes is composed of the doublet microtubules. The central bundle of these microtubules is known as the anoxeme. In an axoneme, a single pair of the singlet micortubules is surrounded by the nine doublet microtubules. When the plasma membrane of the flagellum is opened to expose the axoneme, and the radial spokes are broken, it will lead to the elongation of the axoneme,
20 is the Number of Neutrons of potassium.