For introducing English, NCERT says the key issue is:

1. NCERT notes that beginning English as late as Class V still falls within Lenneberg's window. 2. It says the issue is not so much the age at which English is begun. 3. The issue is the exposure and the facilities made available for learning. 4. It adds that two to three years of good opportunities are better than a prolonged failure of up to ten years. 5. Starting early without support is therefore not the answer. 6. So exposure and facilities matter more than the starting age. **Why the other options fail:** - Starting early regardless of support leads to prolonged failure, not success. - The age of the teacher is not the issue named. - Where the learners live is also not the issue; exposure and facilities are. _Source: NCERT, Position Paper of the National Focus Group on Teaching of English (2006), section "4.1 The critical period or sensitive window hypothesis", PDF p. 28 (ncert.nic.in/pdf/focus-group/english.pdf)_