Respuesta :
The correct options are the first sentence and the last one. The first option is a logical and plausible explanation of the reason why social media has affected school performance. Notice that it is closely related to the claim at the same time it supports the claim.
As for the last option, the fact that it refers to standarized tests, which are taken all over the country, and that they show a contrast in the results in many states suggests that these tests can be used a proof to support the claim. However, it is necessary to note that if this were an essay, using standarized tests to prove a claim is not sufficient.