Concept:Find the total feed consumed in 6 weeks and then multiply it by the cost of 1 kg of feed.Explanation:The chicks are fed 0.7 kg of feed every week.The feeding period is 6 weeks.So, total feed required = 0.7×6=4.2 kg.The price of feed is #5 per kg.Therefore, total cost of feeding = 4.2×5=21.00.This value matches option C.Answer:C. #21.00