Out of the given options, choose the sentence, which in your view, is the most grammatically and structurally correct. Please note that the meaning or the context of the sentence must not change.
Correct answer - 2
Firstly, the sentence is in future tense because 'will' is given. Thus, we cannot take past form of the verb that is 'focused'. Because future-past tense is not the correct format. Thus, options 3 & 4 are eliminated.
Looking at option 5, 'not' is used at the third place in a clause. It means 'India will not be' is the correct phrase. So, option 5 is eliminated.
Whenever we want to show any purpose in a sentence. Always use the infinitive verb instead of gerund verb. Thus, 'for sustaining' in option 1 is not appropriate according to the context. Thus, option 2 is the most appropriate answer.