Step 1: Understanding the Concept:
The Baroda School (also called the Baroda Group) grew around the Faculty of Fine Arts of the M. S. University of Baroda after Independence. It stood for narrative, figurative painting that looked at Indian life and also at world art. We must pick which of the four artists belong to this school.
Step 2: Key Formula or Approach:
Decide for each artist, A to D, whether he was linked with the Baroda faculty. Mark each one true or false. Then choose the option that lists exactly the true ones.
Step 3: Check artist (A) Benode Behari Mukherjee.
Benode Behari Mukherjee was a pioneer of Santiniketan. He taught at Kala Bhavana, the art school founded by Rabindranath Tagore, and is known for his murals and Oriental style. He was not part of the Baroda faculty. So (A) is NOT part of the Baroda School.
Step 4: Check artist (B) K. G. Subramanyan.
K. G. Subramanyan studied at Santiniketan but then taught at Baroda from 1951 for many years. He shaped the thinking of the faculty and is counted among its main figures. So (B) IS part of the Baroda School.
Step 5: Check artist (C) Gulam Mohammed Sheikh.
Gulam Mohammed Sheikh studied and later taught at Baroda. He is a leading painter and writer of the narrative group of the school. So (C) IS part of the Baroda School.
Step 6: Check artist (D) Bhupen Khakar.
Bhupen Khakar was linked with Baroda, where he studied art history and criticism and later joined the artist circle there. His story-like, everyday-life paintings belong to the same narrative current. So (D) IS part of the Baroda School.
Step 7: Check option 1 (A, B and C only).
It includes A, who is not from Baroda, and leaves out D, who is. So option 1 is WRONG.
Step 8: Check option 2 (B and C only).
It leaves out D, who belongs to the school. So option 2 is WRONG.
Step 9: Check option 3 (A, B and D only).
It includes A and leaves out C. Both choices are incorrect, so option 3 is WRONG.
Step 10: Check option 4 (B, C and D only).
It contains exactly the three Baroda artists, B, C and D, and leaves out A. So option 4 is CORRECT.
Final Answer:
B, C and D were associated with the Baroda School, which is option 4.
\[ \boxed{4} \]