Step 1: Understanding the Concept: 
The question asks for the correct sequence of steps involved in creating an illustrated manuscript during the Mughal era. This was a highly specialized and systematic process. 
 
Step 3: Detailed Explanation: 
The creation of a Mughal manuscript followed a logical production line: 
1. (D) Sheets of handmade paper were prepared: The very first step was to create the basic material, which was high-quality handmade paper. 
2. (C) Cut to suit the size of the manuscript: Large sheets of paper were then cut down to the uniform page size required for the specific book being created. 
3. (B) The pages were ruled and filled with text: A scribe (khatib) would then rule the pages and carefully write the text, leaving specific blank spaces for the illustrations. 
4. (A) Making the composition: Finally, the artist (musawwir) would paint the illustrations (the composition) in the spaces left by the scribe. 
This logical flow from raw material to finished artwork gives the sequence (D)$\rightarrow$(C)$\rightarrow$(B)$\rightarrow$(A). The option (D) in the original image contains a typo 'R' instead of 'B', so the intended correct sequence is (D), (C), (B), (A). 
 
Step 4: Final Answer: 
The correct sequence of processes for Mughal book painting is (D) Sheets of handmade paper were prepared, (C) Cut to suit the size of the manuscript, (B) The pages were ruled and filled with text, and (A) Making the composition. 
Rearrange the following parts to form a meaningful and grammatically correct sentence: 
P. a healthy diet and regular exercise 
Q. are important habits 
R. that help maintain good physical and mental health 
S. especially in today's busy world