Concept:
Mrinal Sen was one of the greatest Indian film directors and a major figure of Parallel Cinema in India. His films were known for:
• Social realism,
• Political themes,
• Experimental storytelling,
• Artistic cinematic expression.
To answer this question correctly, we must identify which films are associated with Mrinal Sen.
Step 1: Analyzing film A -- Bhuvan Shom.
Bhuvan Shom is one of the most celebrated films directed by Mrinal Sen.
Important facts:
• Released in 1969,
• Considered a landmark of Indian Parallel Cinema,
• Known for innovative cinematic style.
Thus:
\[
A \text{ is correct}
\]
Step 2: Analyzing film B -- Raathhor.
Raathhor is also associated with Mrinal Sen's cinematic works.
Therefore:
\[
B \text{ is correct}
\]
Step 3: Analyzing film C -- Koshish.
Koshish was directed by:
\[
\text{Gulzar}
\]
and not by Mrinal Sen.
Hence:
\[
C \text{ is incorrect}
\]
Step 4: Analyzing film D -- Kala Bazaar.
Kala Bazaar was directed by:
\[
\text{Vijay Anand}
\]
Therefore:
\[
D \text{ is incorrect}
\]
Step 5: Selecting the correct combination.
The films associated with Mrinal Sen are:
\[
A \text{ and } B
\]
Hence:
\[
\boxed{\text{Option (A)}}
\]