Final answer:
The subject of this question is Biology, and the correct answer is C) Snail.
Step-by-step explanation:
The subject of this question is Biology because it is asking about the delivery of pig feed. In biology, we study various aspects of animals, including their diet and feeding habits. The options provided, A) Sloth, B) Swift, C) Snail, and D) Snack, are all related to different animals, and the question is asking which one best describes the speed at which pig feed is being delivered. Based on the information provided in the reference text, the answer to this question would be C) Snail. The description of the snail's movement in the text aligns with the idea of the pig feed being delivered slowly.