Option (C) is correct because university teaching is related to quaternary sector. Quaternary sector is knowledge oriented economic sectors. It is based on pure knowledge and skill of a person.

Option (A) is not correct because manufacturing computers is an example of secondary sector. Secondary activities include manufacturing of various products.

Option (B) is not correct because paper and raw pulp production is secondary activity. Paper and pulp are made from raw material wood.

Option (D) is not correct because printing books is secondary activity. Printing book involves the assembling and securing written page within a cover.