Nitrates are pollutants. They are harmful when they enter the water supply. Humans are the source of most nitrate pollution Nitrates come from overuse of fertilizer, large-scale animal farms, and septic tanks. The table shows the amount of nitrates the Colorado River over time. Time Period Nitrates Entering Water (lbs) 100,000 150,000 250,000 500,000 800,000 1,200,000 1,400,000 1976-1980 1981 - 1985 1986-1990 1991 - 1995 1996-2000 2001-2005 2006-2010 Which conclusion is best supported by the information in the table?

A. Scientists need to measure the effect of pollution instead of the amount of pollution.

B. Problems associated with an increase in nitrates will continue to get worse over time.

C. Scientists need to reject the data because it only measures one kind of water pollution.

D. The population in the area must have grown exponentially to explain the increase in nitrates.

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