Find the value of the linear correlation coefficient r.

The paired data below consist of the costs of advertising (in thousands of dollars) and the number of products sold (in thousands).

Cost	Number
9	85
2	52
3	55
4	68
2	67
5	86
9	83
10	73

A. 0.071

B. 0.708

C. 0.246

D. 0.235