Using the Analogy of Boulders Vs

Using the analogy of boulders vs. sand for filling a hole, the textbook points out that

A) small businesses are employing a record number of employees because they have to work twice as hard at producing the same amount of output as a large competitor.
B) small businesses can serve niche markets that larger firms do not serve well.
C) the sand represents the small businesses that start and fail each year, while the boulders represent the large companies whose resources permit them to stay the course.
D) large companies serve market niches so much better than small companies.