In the following question, a part of a sentence is given below along with three other phrases
i), ii), and iii). At least one of these three phrases shall be used to make a meaningful sentence with the given phrase. Select the right combination from the given options. Phrase: .. modern advances in DNA research have ..
i).. both the studies explain just how much these .. ii).. improved the study of cancer and its management... iii).. when the lion hunted down the deer ..     

The main phrase talks about 'advances' in 'DNA research'. Phrase iii) is completely unrelated to the main phrase as it talks about a lion hunting a deer, and thus mustn't form part of the sentence, and can be eliminated. On this basis, all options that have phrase iii) in them, [options a), c), d), e)] may be eliminated. Upon checking the only remaining option b) and its sequence, we realise it makes grammatical and contextual sense. Hence, the order must be: i-phrase-ii. Therefore, the correct answer is option b). The complete sentence is: Both the studies explain just how much these modern advances in DNA research have improved the study of cancer and its management.