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Answer (D) is correct . Entering price changes into the computer system should be a centralized duty. Permitting operators to enter the promotional prices creates an opportunity for collusion to sell goods at unauthorized prices to outside accomplices or, at least, makes errors more likely.

Answer (A) is incorrect because The customers would be charged a higher price unless the operator entered the promotional price.
Answer (B) is incorrect because Frequent price changes would not overload an order entry system. Each item needs a price, whether it is the higher price or the promotional price.
Answer (C) is incorrect because Operators could give competitors notice of the promotional price whether or not they enter the prices into the computer.