1. Why did the postman have to walk from village to village?
2.
Why were most villagers illiterate?
3.
Why did the people in Baffin Island use ice blocks to build their houses?
4.
Why did each house have only one room?

Explanation:

A little beyond the starting point on the outskirts of Rhenigidale, you come upon the abandoned village of Gearraidh Lotaigear, which was inhabited until the 1970s with a shop on the shoreline. Further on, a subsidiary path leads to Molingeanais, another abandoned village.

i think it may be b, i'm not exactly too sure on this. but b seems to make more sense.