Select the option that can be used as a one-word substitute for the given group of words.
The arrangement of events or dates in the order of their occurrence.

Correct option is B

The correct one-word for the given group of words is (b) Chronology.
Chronology is the arrangement of events or dates in the order of their occurrence. (कालक्रम)
Example: The historian studied the chronology of the ancient wars.
Meanings of the given other options:
· (a) Calendar: A chart showing days, weeks, and months of a year (कैलेंडर)
· (c) Chronic: Persisting for a long time or constantly recurring (दीर्घकालिक)
· (d) Routine: A regular way of doing things (नियमित कार्यप्रणाली)