Answer:
B. Women bicycle riders were often very competitive with each other, and many rivalries arose as a result of this competitive spirit.
Step-by-step explanation:
In a summary of Chapter 4 of Wheels of Change, Women bicycle riders in the 1880s and 1890s, were often very competitive with each other, and many rivalries such as males, dogs and horses arose as a result of this competitive spirit.
Therefore, it could effectively be placed as a summary because it expresses the key idea objectively.