Given below are four jumbled sentences. Pick the option that gives their correct order.
P. The average adult gets two to four colds a year, while the average child may get six to eight.
Q. It is the most frequent infectious disease in humans.
R. They occur more commonly during the winter.
S. The common cold, also known simply as the cold, is a viral infectious disease of the upper respiratory tract that primarily affects the nose.

Option (d) is the correct order of the given sentences.
Explanation:
· S gives the definition and introduction of the common cold.
· Q logically follows, identifying its frequency and relevance.
· P supports this with data on how common it is in adults and children.
· R concludes with a seasonal context of occurrence.
Structure:
· S (Subject introduction)
· Q (Supporting information)
· P (Data/evidence)
· R (Additional details)