For interchange of superlative to comparative degree, the rule that is followed: ‘Subject + verb + comparative degree + than any other + modifier.’ The given sentence is in superlative form. All other options are inappropriate. So, the correct answer will be: ‘India is larger than any other democracy in the world.’

For interchange of positive to superlative degree, the rule that is followed: ‘Subject + verb + one of the + superlative degree + modifier.’ The given sentence is in positive form. All other given options are inappropriate. So, the correct answer will be: ‘The cow is one of the most useful animal.’

To convert the direct speech into indirect speech, we will remove comma and quotation marks and write conjunction ‘that’ to join the reporting clause and the spoken words. We will also change:

• I^st person pronoun (I)--III^rd person pronoun(he)

• Simple Present (am)--Simple Past (was)

• Here--There

• This--That

So, the correct answer is: Abhishek says that he was glad to be there that evening.

A noun clause is a dependent clause that can be used the same ways as a noun or pronoun. They may begin with a relative pronoun or by, whether, when, where, why or how. Here, for the given sentence, the clause ‘that Canada can resolve its economic problems’ is the object of the verb ‘think’ and answers the question ‘what?’. All other given options are inappropriate. So, the correct answer will be: For the given sentence, the clause is ‘noun clause’.