Pls help Which of the following was a major threat to wagon trains?

A) the abundant coyote population

B) political unrest among the wagon train members

C) dust storms

D) outbreak of tuberculosis

D) outbreak of tuberculosis

Explanation:

One of the major threat to wagon trains was the outbreak of tuberculosis as such diseases were common and were easily spread through an entire wagon camp.

Tuberculosis which induces cough is very easily transmitted from one person to another and was one of the major problems of the wagon trains, also with cholera.

answer; the importation of slaves from africa,//   is the correct answer.