Statement II has tense inconsistency. The word 'lived' is in past tense, hence, 'associate' in the same sentence should be 'associated'(in simple past as well). Statement III again has tense inconsistency. The word 'seem' should become 'seemed' to go with 'were' and 'visited' in the same sentence. Statement IV is incorrect and we need to rephrase it. We may either change 'effort' to 'efforts' or change it to 'an effort'. So, Statements I and IV are correct. Hence, the correct answer is option (d).