The provided correct answer is option 3, which states that a person seeking election to a State Legislative Assembly must have completed the age of 21 years.
Options 1, 2, and 4 are correct statements. Option 1 states that a person seeking election to the Rajya Sabha, which is the Upper House of the Parliament of India, must have completed the age of 30 years. Option 2 states that a person seeking election to the Lok Sabha, which is the Lower House of the Parliament of India, must have completed the age of 25 years. Option 4 states that a person eligible to vote for election to a village panchayat, which is the local self-government in rural areas, must have completed the age of 18 years.
Therefore, option 3 is the statement that is not correct, as the age requirement for election to a State Legislative Assembly is usually higher than 21 years.