Option (B) is correct because catching fish is not a secondary sector activity. Catching fish is a primary activity. Fish is a raw material and we know primary sector includes the production of raw material.

Option (A) is not correct because iron smelting is secondary sector activity. Smelting of iron is a process of applying heat to ore for extracting a metal base.

Option (C) is not correct because making garment is secondary sector activity. Making garment comes under textile industry and it involves processing of raw material.

Option (D) is not correct because basket weaving is a secondary sector activity. It is the process of weaving or sewing pliable materials into two or three dimensional shapes.