Option (B) is correct because trading is a tertiary activity. Tertiary activities include both production and exchange. Without trading nothing will be transported from one place to another. Trading is buying and selling of products.

Option (A) is not correct because farming is a primary activity. It includes growing crops, fruits, vegetables and flowers.

Option (C) is not correct because weaving is a secondary activity. It involves the processing of raw material.

Option (D) is not correct because hunting is a primary activity. It is the practice of killing or trapping animals.