Step 1: Understanding the Concept: 
This question asks to identify the artist commissioned by Mahatma Gandhi to create a series of posters for the 1938 Indian National Congress session at Haripura. 
Step 2: Detailed Explanation: 
In 1938, Mahatma Gandhi wanted the art for the Haripura Congress session to reflect the life of rural India. He personally commissioned Nandalal Bose, a student of Abanindranath Tagore and a leading figure of the Bengal School, for this task. Nandalal Bose created a celebrated series of posters known as the "Haripura Posters." These works, painted on handmade paper, are famous for their bold, calligraphic brushstrokes and vibrant colours, depicting scenes of everyday rural life like musicians, farmers, and artisans. This project was a landmark in modern Indian art, linking it directly with the nationalist movement. 
Step 3: Final Answer: 
Nandalal Bose painted the Haripura posters.
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