According to Article 58 of the Constitution of India, the minimum age limit to be eligible for election as the President of India is 35 years. This requirement ensures that only individuals with sufficient maturity and experience can hold this high office. Here's why the other options are incorrect:
- Option (1): 25 years: This is the minimum age required to become a member of the Lok Sabha (the lower house of Parliament). It is not applicable for the presidency.
- Option (2): 30 years: While this age is higher than 25, it is still below the constitutional requirement of 35 years for the presidency. - Option (3): 35 years: This is the correct answer, as it is the minimum age specified in the Constitution for eligibility to become the President of India.
- Option (4): 40 years: Although 40 years is older than the required age, the Constitution does not set a higher minimum age limit beyond 35. Answer: $\boxed{35 \text{ years}}$