Which of the Following Actions Would Most Likely Be Permissible

Which of the following actions would most likely be permissible according to the conventionalist approach to ethics but impermissible according to the utilitarian approach to ethics?

A) failing to disclose purchase terms and conditions that make one's product less desirable than competing products
B) selling legal products that are addictive and substantially damage the customer's health
C) offering superior pricing and servicing policies to select customers who make a purchase within a specific period of time
D) misleading the customer about the features and benefits of a product or service
E) discontinuing product models that are successful in the marketplace but harmful to the environment