To logically arrange the given sentences, we need to consider the sequence of events as they would naturally occur:
Breaking down the events:
Hence, the correct logical order of the sentences is A, B, C, D.
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