Question

What is aesthetics?
Responses

exploring fundamental questions such as “What is art?” and “What is beauty?”
exploring fundamental questions such as “What is art?” and “What is beauty?”

asking questions about a work of art from a historical perspective
asking questions about a work of art from a historical perspective

describing a work of art based on its period, civilization, and style
describing a work of art based on its period, civilization, and style

determining how an artwork is organized, using the principles of design as a guide

Answer 1

Aesthetics is the branch of philosophy that studies beauty, art, taste, and the nature of aesthetic experience — in short, questions like “What is art?” and “What is beauty?”

How the provided responses map to that:
- “Exploring fundamental questions such as ‘What is art?’ and ‘What is beauty?’” — this is the core of aesthetics.
- “Determining how an artwork is organized, using the principles of design as a guide” — this is formal analysis/visual criticism; it’s closely related and often used in aesthetic discussion, but it’s more a method of analyzing visual properties than the philosophical study itself.
- “Asking questions about a work of art from a historical perspective” and “Describing a work of art based on its period, civilization, and style” — these are art-historical approaches, not strictly aesthetics (though they can inform aesthetic judgment).

So the best short answer: aesthetics = the first response (with the fourth being a related analytical practice).