Answer: OPTION D.
Explanation:
The complete exercise is: "A
ounce package of medicated cough drops cost $0.99 . What is the unit cost?"
Based on the problem, you can follow these steps in order to calculate the unit cost:
First step
You need to convert the mixed number
to a decimal number:

Second step
Finally, you must divide $0.99 by 16.4 ounces. Then you get:

As you can notice, this result matches with the Option D.