The correct answer is option 4: 5. The members of the Lok Sabha, which is the lower house of the Indian Parliament, serve for a term of 5 years. This is stated in Article 83 of the Constitution of India. However, it is important to note that the President of India has the power to dissolve the Lok Sabha before the completion of its 5-year term and call for fresh elections. In such a case, the newly elected members would serve for the remainder of the original 5-year term. It is also worth mentioning that the members of the Lok Sabha can be re-elected for consecutive terms, provided they win the elections.