The situation that most likely violates a consumer's right to be informed is d. Nutrition details are printed on the inner lining of the package.
a. Product is manufactured and sold only by one company: While this might limit competition and choice, it doesn't directly violate the right to be informed. Consumers can still access information about the product through other means.
b. Email and phone complaints to the business are ignored: This is frustrating and hinders communication, but it doesn't necessarily violate the right to be informed. The information might still be available elsewhere.
c. Safety warnings are available through the company website: This makes the information accessible but requires consumers to actively seek it out. While not ideal, it doesn't completely deny access to important safety information.