The correct answer is option 4: "get plenty of rainfall." Tropical rainforests are known for their high amount of rainfall. They receive an average of 80 to 400 inches (200 to 1000 centimeters) of rain per year. This constant rainfall creates a unique and diverse ecosystem, supporting a wide range of plant and animal species.

Option 1 is incorrect because while tropical rainforests can be humid, they are not necessarily "dry and hot" as they receive abundant rainfall.

Option 2 is incorrect as tropical rainforests can be found not only in coastal regions but also inland, primarily near the equator.

Option 3 is incorrect as tropical rainforests are known for their warm and humid climate, so they are not covered in snow.

Therefore, option 4 is the correct answer.