help me answer this question using simpler wording?

The correlational research method is a descriptive method used to establish the degree of relationship between two characteristics, events, or behavior. Correlations are part of our everyday lives and we often use them in decision making. With your knowledge of correlational research method, comment on the research finding below.

A researcher found that spending time on online social networks is negatively correlated with grades. In other words, her study showed that the more time a student spends on online social networks, the lower his or her grades are likely to be.

1. Can she conclude that spending time on online social networks causes low grades? Why?
2. What other explanation would you propose to explain this relationship?
3. Give 3 other reasons why researchers conduct correlational research