Concept:
Susan Sontag was an internationally recognized writer, cultural critic, and intellectual best known for her influential writings on photography, media, culture, and ethics.
Her famous work:
\[
\textit{On Photography}
\]
became one of the most important critical texts in photography theory.
Her critiques mainly focused on:
• Photography and society
• Moral implications of images
• Aesthetic concerns
• Human suffering and representation
Step 1: Analyzing statement A.
Statement A says:
\[
\text{Well known for critiques on paintings}
\]
Susan Sontag was not primarily known as a painting critic.
Her major recognition came through photography criticism and cultural theory.
Thus:
\[
A \text{ is incorrect}
\]
Step 2: Analyzing statement B.
Susan Sontag wrote extensively on:
• Photography
• Image culture
• Visual representation
Therefore:
\[
B \text{ is correct}
\]
Step 3: Analyzing statement C.
Sontag frequently discussed:
• Moral concerns
• Ethical representation
• Aesthetic interpretation
• Human sensitivity in photography
Thus:
\[
C \text{ is correct}
\]
Step 4: Analyzing statement D.
Susan Sontag was not primarily concerned with:
• Technical perfection
• Camera engineering
• Mechanical photographic precision
Her work was more philosophical and cultural.
Hence:
\[
D \text{ is incorrect}
\]
Step 5: Choosing the correct combination.
The correct statements are:
\[
B \text{ and } C
\]
Thus:
\[
\boxed{(3)}
\]
Final Conclusion:
Susan Sontag was famous for critiques on photography and for raising moral and aesthetic questions.
Hence the correct option is:
\[
\boxed{(3)\; B \text{ and } C \text{ only}}
\]