Question

In 2005, insomnia was the most common sleep disorder in the UK, followed by sleep apnea and narcolepsy, in that order. The incidence rates for both sleep apnea and narcolepsy increase with weight, but the incidence rate for insomnia is the same for people of all weight categories. The average weight of the UK population has increased between 2005 and 2015. Which of the following conclusions can be most properly drawn about sleep disorders in the UK from the information given above?

A A majority of the population was affected by at least one of the sleep disorders mentioned above by the year 2015.
B Sleep apnea became the most common sleep disorder in 2015.
C Insomnia was more common than either sleep apnea or narcolepsy in 2015.
D Fewer people suffered from insomnia in 2015 than had suffered from it in 2005.
E The average weight of people suffering from insomnia has increased between 2005 and 2015.
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