Why does the fact that animals are sentient render their legal status as property problematic?

Because it is not possible for animals, as sentient beings, to express whether they are satisfied with their property status and if they are being well cared for.

Explanation:

Sentient beings are living beings that do not have the ability to feel or show any kind of emotion. Animals are considered sentient beings and this makes the legal property status of animals such a problematic and sensitive issue.

Animals as living beings must be treated with respect and have a full and satisfactory life, but it is impossible for the animal, in captivity, to express whether it is satisfied with this type of life. This animal also cannot show if it is well cared for and if it has a happy life, therefore, it is not possible to determine if this property status is being beneficial and positive for the animal's life.

in an absolute  monarchy, the  monarchrules as an autocrat, with absolutepower  over the state and government — for example, the right to rule by decree, promulgate laws, and impose punishments. the  monarch isnominally sovereign but the electorate, through their legislature, exercise political sovereignty.

it would be d). more resources must be obtained to attain that combination of goods and services