1 – Correct
The headline says that there is a growing digital divide. However, the survey is only for social networking sites. The survey may not support the headline because the older age group may be using other digital appliances.
2 – Correct
Results from one survey cannot be generalised for the whole population. Also, in order to show a increase in gap, we need results from an earlier survey for comparison.
3 – Wrong
Statement 3 doe not mention anythign about the headline and the contents of the survey.
Since statements 1 and 2 are correct, D is the answer.