Under the Civil Registration System (CRS), it is legally mandatory to register birth and death events within how many days in India?

1. A

   15 days

   Fifteen days is not the statutory window under the Registration of Births and Deaths Act as applied in CRS teaching. The mandated period is 21 days.

2. B

   21 days

   Under the Civil Registration System, birth and death must be registered within 21 days of the event (Registration of Births and Deaths Act, 1969). That is the official key.

3. C

   26 days

   Twenty-six days is not the legal period.

4. D

   30 days

   Thirty days is a common guess (and some delayed-registration slabs use other intervals) but the basic mandatory window taught here is 21 days.

Summary. Official key is (b) 21 days. CRS/RBD Act requires registration of birth and death within 21 days. 15, 26 and 30 are distractors.