**Core Concept**
The Reproductive and Child Health (RCH) programme is a key component of India's National Health Mission, aiming to improve the health and well-being of mothers and children. Districts are categorized based on their demographic and socio-economic characteristics to tailor interventions effectively.

**Why the Correct Answer is Right**
Districts are divided into three categories: High Performance, Average Performance, and Low Performance, based on two key indicators: Crude Birth Rate (CBR) and Female Literacy Rate (FLR). CBR measures the number of live births per 1,000 population per year, reflecting the reproductive health status of a district. FLR, on the other hand, is a proxy for socio-economic status, as higher literacy rates are associated with better health outcomes. This dual approach allows for a nuanced understanding of a district's RCH needs.

**Why Each Wrong Option is Incorrect**
**Option A:** Crude birth rate & infant mortality rate are related but distinct indicators. While CBR is a measure of fertility, infant mortality rate reflects mortality rates among children under one year. Combining these two does not provide a comprehensive picture of a district's RCH needs.
**Option C:** Crude death rate & crude birth rate are both important indicators, but they are not the primary criteria for categorizing districts under the RCH programme. CDR measures mortality rates, whereas CBR reflects fertility rates.
**Option D:** Couple protection rate & infant mortality rate are relevant indicators, but they are not the primary criteria used for district categorization. Couple protection rate measures the percentage of couples using modern contraceptive methods, while infant mortality rate reflects child health outcomes.

**Clinical Pearl / High-Yield Fact**
When assessing a district's RCH needs, it's essential to consider both demographic and socio-economic factors. By combining Crude Birth Rate and Female Literacy Rate, policymakers can identify areas that require targeted interventions to improve maternal and child health outcomes.

✓ Correct Answer: B. Crude birth rate & female literacy rate