Concept:Beef cattle are bred for meat production, so dairy-focused traits are not essential.Explanation:I. Increased butter-fat percentage matters for dairy cattle, not for beef cattle.II. High feed conversion efficiency is important because it helps beef cattle gain weight faster with less feed.III. High yield of lean meat is important since it improves the quality and market value of beef.Hence, the trait that is not important in beef cattle production is I only.Answer:A. l only