If October 21 is a Sunday, what day will it be on November 21?

Correct option is C

Given
October 21 = Sunday
Target Date = November 21

Solution
Total days in October = 31
Days remaining in October = 31 - 21 = 10 days
Days in November = 21 days
Total days to count = 10 + 21 = 31 days
Number of odd days =$$\frac{31}{7} \Rightarrow$$​ Remainder = 3
Required Day = Sunday + 3 days = Wednesday

Final Answer
So the correct answer is (c)