High riggers, sawyers or buckers, skitters and hauliers or transporters are categories of which profession?
A. Agriculture
B. Miners
C. Fishermen
D. Lumberjacks

Hint: All the given activities are part of the primary sector and contribute to the economy of a place or a country through the primary sector. The primary sector includes activities that are involved in the extraction and production of raw materials. It makes up a large portion of the economy, especially in developing countries.

Complete answer:
Option A: is incorrect. Farming or agriculture includes crop cultivation and rearing of animals. The practice of farming dates back to the neolithic era when humans gave up nomadic hunting and started setting down to form communities. River valleys around which civilisations developed in the ancient times were sustained through farming because it produces food in various forms.
Option B: is incorrect. Raw materials like minerals are extracted from the earth’s surface through the process of mining. Some examples of materials largely-mined around the world include metals, coal, oil shale, gemstones, limestone, chalk, salt, etc. However, mining is just the first step in the process of extraction of raw materials as they then have to be cleaned and processed for industrial use.
Option C: is incorrect. Fishing as an activity provides an additional food source for humans especially in areas located near seas and oceans. The term fishing is used as an umbrella term to cover all aquatic organisms including molluscs, crustaceans, cephalopods, echinoderms, etc, however, it does not apply to pisciculture and catching of larger aquatic mammals like whaling.
Option D: is correct. Logging as an activity includes cutting, processing and moving of trees. It is widely used as raw material for construction, housing, generating energy, producing paper products, etc. To ensure the division of labour, various professions within lumberjack have come up, including high riggers, sawyers or buckers, skitters and hauliers or transporters.
Hence, the correct answer is, ‘D. Lumberjacks’.

Note: As farming, mining, fishing and logging are all part of primary sector activities, read the categories given in the question carefully and see which one corresponds with the given options.