(d) A-(iii), B-(iv), C-(ii), D-(i)
Copper is used in electric cables and utensils; Bauxite is used in aluminium production; Mica is used in electric and electronic industries; Manganese is used in manufacturing of steel and paints.
Remember the specific uses: Copper — good conductor, so cables/utensils; Bauxite — ore of aluminium; Mica — heat/electricity resistant, used in electronics; Manganese — alloying agent for steel and also used in paints. These are standard facts from the Mineral Resources chapter (Ch. 5, Contemporary India II).