Step 1: Understanding the Question:
• Each standardization mark must be matched with the product it is used for.
Step 2: Detailed Explanation:
• ECO Mark is given to environment-friendly consumer products such as soaps and detergents, so A matches II.
• AGMARK certifies agricultural products such as spices, so B matches IV.
• ISI mark covers industrial products and is matched here with building materials, so C matches I.
• Hall Mark certifies the purity of gold, so D matches III.
Step 3: Final Answer:
The matching is A-II, B-IV, C-I, D-III. The correct option is (B).