a pit where granite is ground up into gravel a neighborhood where lawn chemicals are used a junkyard where old cars are salvaged for parts a grain elevator where corn and soybeans are stored
I am hesitating between 4 options to answer the following question, which option should I choose?
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?
Possibilities:
- a pit where granite is ground up into gravel
- a neighborhood where lawn chemicals are used
- a junkyard where old cars are salvaged for parts
- a grain elevator where corn and soybeans are stored

a neighborhood where lawn chemicals are used