Correct option is B
✅ (b) 6.7: • Fresh cow or buffalo milk is slightly acidic, with a pH around 6.6 to 6.8. • As milk spoils, pH decreases due to lactic acid formation. • Proper pH indicates freshness and good quality.
❌ (a), (c), (d): • 5.5 is too acidic (spoiled), 7.4 and 8.5 are alkaline.