Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. Humans contact other species during population growth into previously little-inhabited areas. B. Species that carry diseases deadly to humans live in areas with small, mobile populations. C. Increased mobility and population expansion into new areas exposes humans to new, deadly diseases carried by other species. D. Some species that humans contact in little-inhabited areas are immune to diseases that are deadly to humans.