Step 1: Understanding the Question:
• The question asks for the optimum seed rate of the small-seeded (microsperma) type of lentil.
Step 2: Detailed Explanation:
• Lentil is grown as two types: microsperma (small-seeded) and macrosperma (bold-seeded).
• The recommended seed rate for small-seeded (microsperma) lentil is 40-45 kg/ha, whereas the bold-seeded (macrosperma) type needs a higher rate of about 55-60 kg/ha.
• Hence 40-45 kg/ha matches the microsperma type, and the other ranges do not.
Step 3: Final Answer:
The correct option is (A) 40-45 kg/ha.