Step 1: Statement (A)
There was indeed no single belt of Muslim majority areas in British India. Muslims were dispersed in different regions and did not form a continuous geographical belt. This statement is correct.
Step 2: Statement (B)
Khan Abdul Gaffar Khan of the North Eastern Frontier Province did indeed oppose the idea of the two-nation theory. However, this was not the case in every instance. He stood for a united India and was a strong opponent of the partition. This statement is correct.
Step 3: Statement (C)
There were indeed regions in Bengal and Punjab where non-Muslims were in the majority, and the partition created new borders that divided communities. This statement is correct.
Step 4: Statement (D)
The violence during Partition did affect minorities on both sides of the new borders. Hindus and Sikhs were targeted in Pakistan, while Muslims were targeted in India. This statement is correct.
Step 5: Final Answer
The correct statements are (A), (C), and (D). Therefore, the correct answer is Option 4.