Concept:The day of the week changes by the number of odd days, which is the total days modulo
7.
Explanation:Remaining days in June after 1st June
=30−1=29.
July
=31, August
=31, September
=30, October
=31, November
=30.
Days in December up to 3rd December
=3.
Total days
=29+31+31+30+31+30+3=185.
Odd days
=185÷7, remainder
=3.
Starting from Thursday, add
3 days: Friday, Saturday, Sunday.
So, 3rd December is Sunday.
Answer:Reyansh’s birthday is on Sunday, i.e., Option B.