Answer: Option D
Explanation: Utility in simple words is the usefulness of any good or service. Utility is a qualitative characteristic and usually cannot be determined in quantitative terms. For example - how much one enjoyed a trip to disney land is the utility of that trip.
As explained earlier it is a qualitative characteristic, therefore, each individual has its own measure of utility based on their own preference and choice.
Hence, from the above we can conclude that option D is correct.