Step 1: Understanding economic sectors.
The economy is divided into three main sectors: Primary (Agriculture), Secondary (Industry), and Tertiary (Services). Mining involves extraction of minerals and raw materials, which comes under industry.
Step 2: Analyzing the options.
(A) Agriculture sector: Incorrect — it involves farming and allied activities.
(B) Industrial sector: Correct — mining and quarrying are part of the secondary/industrial sector.
(C) Service sector: Incorrect — involves trade, IT, transport, etc.
(D) None of these: Incorrect.
Step 3: Conclusion.
Thus, mining is included in the Industrial sector.