To become a member of Rajya Sabha, a person should be a citizen of India and at least ______ of age.

30 years

The correct answer is Option 1 - 30 years

The Rajya Sabha, also known as the Council of States, is the upper house of the Indian Parliament.  The Constitution of India lays down specific qualifications for membership in Article 84. Here's why the minimum age is set at 30:
The Rajya Sabha is envisioned as a chamber of experienced and mature individuals.  The additional years compared to the Lok Sabha (lower house) minimum age of 25 allows for a greater chance of members having established careers or experience in public service.