Concept:
A multidisciplinary artist is an artist who does not work only in one medium.
Such an artist may work in painting, sculpture, printmaking, drawing, mural, installation, design or other art practices.
Step 1: Check Somnath Hore.
Somnath Hore was known for printmaking, sculpture and drawing.
His famous works include print series and sculptural works such as the “Wounds” series.
So, Somnath Hore is a multidisciplinary artist.
\[
A = \text{Correct}
\]
Step 2: Check Shankho Chaudhury.
Shankho Chaudhury was mainly known as a sculptor, but his artistic practice also included drawing, design and modern art experimentation.
So, he is also counted among multidisciplinary artists.
\[
B = \text{Correct}
\]
Step 3: Check Rini Dhumal.
Rini Dhumal worked in painting, printmaking and other visual forms.
She is also associated with modern Indian graphic and visual art practice.
So, Rini Dhumal is also correct.
\[
C = \text{Correct}
\]
Step 4: Final conclusion.
Thus, the correct group of multidisciplinary artists is:
\[
A,\ B,\ C
\]
Hence:
\[
\boxed{\text{(A) A, B and C only}}
\]