Read the following information and five statements given below it carefully and answer the question which follow :
Excerpt from a research report - 'Average life expectancy in southern part of India is far more than that in Western India. While the average life of a native of South India is 82 years, the average life of a native of Western India is only 74 years.'
Based on the above fact, the proposal that the above study makes is that if an individual moves from Western India to South India, his/her life life expectancy would immediately increase by eight years.
Which of the following statement would weaken the above-mentioned studies proposal that people belonging to Western parts of India should move to South India to increase their life expectancy ?
1) The average life expectancy of population living in Eastern part of the country is also less than the population living in South India.
2) Nearly `80%` of the population in Southern India has a minimum age of 83 years
3) Higher life expectancy in Southern India can be ascribed to the genetic makeup of the population belonging to that area.
4) The average life expectancy of South India is comparable to the best averages in the world.
5) Higher life expectancy in the Southern India can be attributed to better environmental conditions and better healthcare facilities.

Explanation

3,