Option 1: (B), (C), (D), (A) -> When a firm operates in imperfect competition (downward-sloping demand curve), the total revenue follows a predictable sequence: It starts from the origin when quantity is zero (B), then increases at a diminishing rate as price falls and quantity rises (C), reaches maximum when marginal revenue equals zero (D), and finally falls when further price reductions make marginal revenue negative (A). This represents the typical inverted U-shaped total revenue curve for a monopolistic firm. -> correct