What is the theme of Dog-walk by Mary Balazs?

the answer is:

b) to show the progression of inventions that took place in the bicycling industry.

hope it !

voracity is the noun corresponding to the adjective voracious, which means (1) eager to consume a great amount of food, or (2) marked by an insatiable appetite. veracity is far more common than the rare voracity, so the latter is sometimes used in place of the former.

the answer is a (apex)