Step 1: The Reproductive and Child Health (RCH) programme is planned and managed using the district as its operational unit. Its various activities are targeted at the district level.
Step 2: The programme follows a differential approach. Inputs are not uniform across all districts - while the core care components are the same everywhere, weaker districts receive more support and the relatively advanced districts get more sophisticated facilities.
Step 3: Districts are divided into categories A, B, and C on the basis of crude birth rate and female literacy rate, and are covered in a phased manner. Because the unit of planning and grouping is the district, the correct answer is (c). Sub-centre, Anganwadi, and Taluka are smaller delivery points, not the planning unit.