According to the National Health Service (NHS), which provides healthcare for all UK citizens based on their need for healthcare rather than their ability to pay for it,  the normal weight of a baby who reaches full term between 37 and 40 weeks is 2.7 to 4.1 kg, with an average weight of 3.5 kg. A researcher concerned about the effect of poverty on birth weight is conducting a study to see whether the average weight of newborns born in the borough of Hackney (population 273,500) which has one of the highest poverty rates in London is significantly different from the mean reported by the NHS. A random sample of 100 full term babies born to mothers residing in Hackney in 2017 is obtained from hospital records. The mean birth weight of these 100 babies is found to be significantly lower than that reported by the NHS. To which of the A–E groups can the results be generalized? 

A. Full-term babies born in the UK in 2017 

B. The 273,500 residents of Hackney in 2017 

C. Full-term babies born in London in 2017 

D. The 100 randomly selected full-term babies born in Hackney in 2017 

E. Full-term babies born in Hackney in 2017