TOEFL Listening: TPO-TOEFL阅读TPO - BJUGVOQ5DLBS1II0N$

In paragraph 5, why does the author provide the information that "A fifteen-speed racing bicycle is more likely to break down than a child's tricycle?" A. To illustrate a general principle about the stability of systems by using an everyday example B. To demonstrate that an understanding of stability in ecosystems can be applied to help understand stability in other situations C. To make a comparison that supports the claim that, in general, stability increases with diversity D. To provide an example that contradicts mathematical models of ecosystems