Concept:Number of birds = Total floor area ÷ Floor space per bird.Explanation:Recommended space per layer is 0.6m2.Total area of the poultry house is 72m2.Using the formula: Number of layers = Space per birdTotal area.So, Number of layers = 0.672.To divide easily, multiply the numerator and denominator by 10: 0.6×1072×10=6720.Now compute: 6720=120.Therefore, the poultry house can hold 120 layers.Answer:D. 120