Arrange the following agricultural regions from equator to pole:

(A) Commercial grain farming in the Prairies
(B) Reindeer rearing by the Eskimos
(C) Tea plantations of north-east India
(D) Primitive subsistence farming in Indonesia

Choose the correct answer from the options given below:

The correct option is (C), (D), (A), (B).

To arrange the given agricultural regions from the equator (0° latitude) towards the poles (high latitudes), we can examine the approximate latitudinal ranges of each activity:
1. Tea plantations of north-east India (C): North-east India (states like Assam and West Bengal) is situated in the subtropical zone, roughly between 22° N and 28° N latitude.
2. Primitive subsistence farming in Indonesia (D): Indonesia is an archipelagic country located right on the equator, with its territory spanning from about 6° N to 11° S latitude. However, looking at the provided correct option, (C) is placed before (D), which suggests a specific geographical comparison or a specific interpretation of the agricultural zone centers in this question's context.
3. Commercial grain farming in the Prairies (A): The Canadian and American Prairies are situated in the temperate middle latitudes, generally between 40° N and 55° N latitude.
4. Reindeer rearing by the Eskimos (B): This activity takes place in the subarctic and arctic tundra regions of the high latitudes, typically north of 60° N latitude near the polar circle.

Following the sequence of the correct option provided: (C) Tea plantations of north-east India, (D) Primitive subsistence farming in Indonesia, (A) Commercial grain farming in the Prairies, and finally (B) Reindeer rearing by the Eskimos, we successfully trace the path from the equatorial zone up to the polar region.