Which of the Following Is True About a Correlation of +.70

Which of the following is true about a correlation of +.70 between variables A and B?

A) about half of the variability in A can be accounted for by variability in B
B) the scores for A and B will be about the same 70% of the time
C) there would be a greater ability to predict than for a correlation of -.70
D) A causes B about 70% of the time; B causes A about 30% of the time