Question: A drinking water reservoir for a small town develops a blue-green algae bloom. The town hires a company to eliminate the problem. Which of the following should the company investigate first as a likely source of the problem?

  Options: 
 A. a pit where granite is ground up into gravel
 B. a neighborhood where lawn chemicals are used
 C. a junkyard where old cars are salvaged for parts
 D. a grain elevator where corn and soybeans are stored
Answer: B