Both sentences B and D talk about children missing out on vaccination. It is clear D follows B, as sentence B talks of the past and D the present day situation with regard to children missing out on vaccination. Sentence A too talks of vaccination and how urbanization is posing challenges in this matter. Sentence A is a generalized statement, and is likely to precede the sentences B and D. Now let’s have a look at sentence C. This states that without strong health systems, it is difficult to prevent and control outbreaks in areas where population density is high. And this is not just because of the higher risk of infection spreading in such areas. This begs the question, what else causes/adds to the problem? Sentence A seems to offer an answer. Vaccination is our best defense against spread of infectious diseases, but even with this, urbanization causes problems. That is, without strong health systems, controlling outbreaks is more difficult not just because the risk of the disease spreading is higher, but because even our best defense against outbreaks- vaccination- is difficult. So, we know A follows C. Sentences B and D illustrate the point made by sentence A. So the right order of sentences is CABD. Correct Answer: CABD
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