Loneliness and social isolation have been linked with premature mortality and with functional decline in older people.
We found that high levels of loneliness, but not of social isolation, increased the risk of becoming physically frail.
Neither loneliness nor social isolation were associated with the rate of change in a more broadly defined frailty index.
Loneliness
Loneliness is a subjective feeling of dissatisfaction with one’s social relationships. Both social isolation and loneliness have been linked with increased mortality [2–4], incident heart disease [5, 6] and functional decline [7, 8]. Social isolation and loneliness tend to be correlated, albeit weakly .
Social isolation :
Social relationships are important for health . Most such research has focused on social isolation or loneliness. Social isolation is defined objectively using criteria such as having few contacts, little involvement in social activities and living alone.
Frailty :
Frailty is a clinical syndrome whose main feature is heightened vulnerability to stressors due to lowered physiological reserves, decline in the ability to maintain homeostasis and impairments in multiple systems
A frailty index score reflects the proportion of potential deficits present  The phenotype model defines frailty in physical terms, whereas the cumulative deficit model uses a broader definition of frailty.
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The correct answer to this open question is the following.
Although there are no options attached we can comment on the following.
The developments in the information age which brought significant changes in the way you live your life today are basically the way people connect to each other using the internet, the way news is broadcasted in digital formats,  the presence of mobile devices in our society, and the way people choose entertainment formats through these new technologies. 
The internet had changed the life of humans on planet Earth. The fact that everybody is connected to everybody at any time, anywhere, with no restriction, is a major change. 
This has been seen as a threat to governments because the internet is a way to communicate the truth and expose lies and corruption. 
Another important thing is that this can of connection allows humans to know what is happening on the other side of the world, immediately. And we do not need formal news channels to inform us. People informing people is powerful. No more political bias. 
 
        
             
        
        
        
<span>D: The economic historian would only be interested in the numbers, and is looking to create a data table.</span>