(A) Gopher tortoise hatchlings are preyed on by raccoons and other animals, but adult gopher tortoises have no natural predators in the wild.
Explanation: This talks about predators of hatchlings and adult tortoises, but it does not explain how the disease spreads among widely separated tortoise populations. Does not help to explain the spread.
(B) People frequently pick up gopher tortoises and take them home as pets before letting them go in places where they have seen other tortoises.
Explanation: This is the most relevant answer. If people are moving gopher tortoises around, the tortoises could be brought into contact with infected tortoises in new areas, helping to spread the disease. This explains how the disease could spread even though the tortoises do not naturally travel far. This helps to explain the spread.
(C) The preferred habitat of gopher tortoises is ideally suited for growing citrus crops, but gopher tortoises cannot survive in areas planted with citrus trees.
Explanation: This option discusses the habitat preferences of gopher tortoises, but it does not explain how the disease spreads. Does not help to explain the spread.
(D) The largest area currently inhabited by gopher tortoises is a tract of land that is preserved by the national government.
Explanation: This provides information about the location of a large population of tortoises but does not explain how the disease spreads between widely separated populations. Does not help to explain the spread.
(E) Gopher tortoises are generally inactive in cool weather and spend the winter months in a dormant state in their burrows.
Explanation: This describes the tortoises' behavior in cool weather but does not explain how the disease spreads among widely separated populations. Does not help to explain the spread.
The correct answer is (B)