The goal is to arrange the given agricultural regions from closest to the equator to closest to the pole. Here's how to approach the task:
Using this logical arrangement, we conclude that the order from equator to pole is: (D), (C), (A), (B).
To arrange the agricultural regions from the equator to the pole, we need to consider their geographical locations and climate:
Thus, the correct order from the equator to the pole is: (D) Primitive subsistence farming in Indonesia, (C) Tea plantations of north-east India, (A) Commercial grain farming in the Prairies, and (B) Reindeer rearing by the Eskimos.
So, the correct answer is (B): (D), (C), (A), (B).