Concept:
Ustad Abdul Karim Khan was one of the greatest vocalists of Hindustani classical music.
He was a major figure of the Kirana Gharana.
Step 1: Check option (A).
Abdul Karim Khan was associated with Arya Sangeet Vidyalaya.
So, option (A) is related to him.
Step 2: Check option (B).
He was a great vocalist of Kirana Gharana.
So, option (B) is also related to him.
Step 3: Check option (C).
Rambhau Kundagolkar, also known as Sawai Gandharva, and Suresh Babu Mane are associated with his musical tradition.
So, option (C) is also related to him.
Step 4: Check option (D).
The pen name ‘Sabrang' is not related to Abdul Karim Khan.
Therefore, option (D) is the odd one.
Step 5: Final conclusion.
The option not related to Abdul Karim Khan is:
\[
\boxed{\text{Pen Name - `Sabrang'}}
\]
Hence:
\[
\boxed{\text{(D)}}
\]