Arrange the following theories in chronological order starting from oldest to latest:
(A) Keynesian Theory of Demand for Money 
(B) Quantity Theory of Money 
(C) Cambridge Cash Balance Approach 
(D) Modern Quantity Theory of Money 
Choose the correct answer from the options given below: 
 
The sum of the payoffs to the players in the Nash equilibrium of the following simultaneous game is ............
 
| Player Y | ||
|---|---|---|
| C | NC | |
| Player X | X: 50, Y: 50 | X: 40, Y: 30 | 
| X: 30, Y: 40 | X: 20, Y: 20 | |
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