Answer:
The option that would correctly complete the sentence is D.Jack's.
Because he has to take care of the animal, it will be Jack's decision.
Explanation:
In English, the possessive case ('s) is used for showing possession or ownership. An apostrophe and the letter s are introduced after a noun or pronoun to express that a person, place, or thing owns another.
In the case of this sentence, one can say that the pronoun or noun that needs to be introduced is singular -because of the reference to the pronoun he. Jack is the noun in singular form, and one should add the possessive case ('s) to show "possession" of the decision. Therefore, option D. Jack's is the correct answer.
