Option 2 is the correct answer, which states that both elections and citizenship provisions of the Constitution of India became effective from 26th November 1949.

Let`s dissect each option:

- Option 1 states that only elections became effective from 26th November 1949. This is incorrect, as citizenship provisions also became effective from the same date.

- Option 2 correctly states that both elections and citizenship provisions became effective from 26th November 1949. This is the correct answer.

- Option 3 states that elections, citizenship provisions, and emergency provisions became effective from 26th November 1949. This is incorrect, as emergency provisions did not become effective from that date.

- Option 4 states that citizenship provisions and appointment of judges became effective from 26th November 1949. This is incorrect, as elections also became effective from that date.

Therefore, the correct answer is option 2. Both elections and citizenship provisions of the Constitution of India became effective from 26th November 1949.