Why does the author mention (X)? The author mentions (X) in order to… The author includes the information of (X) in order to… The author uses (X) as an example of… The author mentions (X) for which of the following reasons? The author does (X) in order to… What is the author’s purpose in mentioning…
to show/to illustrate to account for/to explain to support/to refute/to oppose to criticize/to question to contrast/to compare
 Darwin's theory is that 'selective breeding' occurs in nature as 'natural selection' is the engine behind evolution. Thus, the theory provides an excellent basis for understanding how organisms change over time. Nevertheless, it is just a theory and elusively difficult to prove. One of the major holes in Darwin's theory revolves around “irreducibly complex systems.” An irreducibly complex system is known as a system where many different parts must all operate together. As a result, in the absence of one, the system as a whole collapses. Consequently, as modern technology improves, science can identify these “irreducibly complex systems” even at microscopic levels. These complex systems, if so inter-reliant, would be resistant to Darwin's supposition of how evolution occurs. As Darwin himself admitted, “To suppose that the eye with all its inimitable contrivances for adjusting the focus for different distances, for admitting different amounts of light, and for the correction of spherical and chromatic aberration, could have been formed by natural selection, seems, I free confess, absurd in the highest degree.
Question: In paragraph 4, what was the author's purpose of including a quote that the belief that the complexity of the human eye could have been formed by natural selection seems highly unlikely?
A. To provide evidence that irreducibly complex systems exist
B. The proof that the natural selection contradicts the basis of Darwin
C. The support that the natural selection contributes to the basis of Darwin
D. The support the claim that natural selection is just a theory and difficult to prove