Step 1: Understanding the Question:
We must pick the manuscripts counted under the Western Indian School of painting.
Step 2: Use the NTA key:
The NTA final answer key marks B, C and D (Nimatnama, Chaurpanchashika and Sangrahini Sutra) as the correct set.
Step 3: Statement A:
Astasahasrika Prajnaparamita is not counted in this set by the key.
Final Answer:
The correct option is 4 (B, C and D only), as per the NTA final answer key. \[ \boxed{\text{B, C and D only}} \]