Researching a bit I found the rest of your question....
Which of the following indicates a fairly strong relationship between X and Y?
a.R2=0.9
b.The p-value for the null hypothesis ?1=0 is 0.0001
c.The t-statistic for the null hypothesis ?1=0 is 30
And the correct answer is a)
R2 (R squared) , known as the coefficient of determination, allows us to estimate the quality of a certain model. More specifically, how well data fits the model. This translates in a strong relationship between X and Y.