Explanation:

Let’s break it down:

- Option 1: 1 to 7 days

? This is too early. Castrating lambs this young can lead to higher stress and risk of complications. Most sheep handlers avoid it this early unless necessary, but it's not the ideal time.

- Option 2: 10 to 40 days

This is the recommended and most common window. The lambs are old enough to handle the procedure with less risk, and healing is usually quick. Stress is minimized, and there's less chance of complications.

- Option 3: 30 to 60 days

Acceptable, but waiting too long bumps up behavior issues (like aggression), and it’s generally better done earlier within this range.

- Option 4: 50 to 70 days

Now you’re on the later side. Healing takes longer, and some negative behaviors may have already started.

- Option 5: After 90 days

Really late. Higher risk of stress, complications, and bad habits are already set in.

Correct answer: Option 2 (10 to 40 days)

That’s the sweet spot for castration if the ram is to be sold.