One major threat to humans is the untreated sewage emptied into lakes and rivers. This type of waste
attracts infectious organisms that cause diseases such as cholera, typhoid, and dysentery.
Which one of the following statements is true about these disease-causing wastes?

A) They are a minor issue in lesser-developed countries but cause frequent problems in the United States.

B) They are a major issue in both lesser-developed countries and in the United States.

C) They are a minor problem in both lesser-developed countries and in the United States.

D) They are a major issue in lesser-developed countries but cause only infrequent problems in the United
States.