Final answer:
The correct list of subsets for the set {cow, horse} is {}, {cow}, {horse}, and {cow, horse}, which includes the empty set and the set itself.
Step-by-step explanation:
The question asks to list all the subsets of the given set {cow, horse}. The correct answer to this question is option C. Here is the complete list of subsets including the empty set:
{}
{cow}
{horse}
{cow, horse}
Remember, the empty set, also represented as ∅, is a subset of every set, and every set is a subset of itself.