Select the INCORRECTLY spelt word.

Correct option is B

Option (b) is incorrectly spelt word.
Correct spelling is: Calendar – a chart or series of pages showing the days, weeks, and months of a particular year. (कैलेंडर)
Example: I marked the meeting date on my calendar.
Meanings of all the given options:
· (a) Apology – An expression of regret (माफ़ी)
· (b) Calender ❌ – Incorrect spelling of "Calendar"
· (c) Ensure – To make sure (सुनिश्चित करना)
· (d) Certificate – An official document (प्रमाण पत्र)