This question presents a sentence, part of all of which is flagged by "Il" . Beneath the sentence you will find five ways of phrasing the flagged part. Follow the requirements of standard written English to choose your answer, paying attentions to grammar, word choice and sentence construction. Select the option that produce the most effective sentence. In 2000 , a mere two dozen products accounted for half the increase in spending on prescription drugs, II a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing I| many more prescriptions for higher-cost drugs. Resposta obrigatória which occurred not just because drugs are becoming more expensive but doctors are also writing a phenomenon occurring not just because of drugs that are becoming more expensive but because of doctors having also written a phenomenon that is explained not just because of more expensive drugs but by the fact that doctors are writing which occurred not just because of more expensive drugs but because doctors have also written a phenomenon that is explained not just by the fact that drugs are becoming more expensive but also by the fact that doctors are writing