A global logistics company calculates the correlation coefficient (r) between the distance a delivery truck travels and its maintenance costs to be +0.90.

What is the coefficient of determination, and what does it signify?

0.90; 90% of the variation in maintenance costs is explained by the distance traveled.

0.81; 81% of the variation in maintenance costs is explained by the distance traveled.

0.81; 81% of the variation in distance traveled is caused by maintenance costs.

1.80; Maintenance costs increase by 1.80 for every mile traveled.