Your correct answer: option B
In the 1950, we see how hot it had gotten. When it would get this hot, it would be very hard for the area to have rain, which would make sense why your answer is not your last answer.
Your answer is not C, because we can see that the degrees was 200, and the rivers would not freeze. If anything, they would boil.
And also option A would have the same concept.
Your answer: option B