Although you might think it is impossible for animals to survive in freezing temperatures, A) they don't
B) it gets very cold
C) they do
D) it's -30 degrees Fahrenheit

c is the correct answer because some animals can survive the temperatures

part a.   = c.)

part b. = a.)

explanation:

i'm thinking it would be when compound subjects are joined by or, nor,either-or, neither-nor.