It has been hypothesized that there is no difference in the mathematical accuracy of men and women. A sample of men and women were given math tests. The scores on the tests are given below.

Women	Men
Person	Score	Person	Score
1	95	1	80
2	86	2	87
3	100	3	93
4	100	4	95
5	99	5	97
6	98	6	82
7	88	7	89
8	92	8	86
9	94	9	75
10	89	10	82
11	79

The Spearman rank-correlation coefficient for 20 pairs of data when d_i² = 50 is _____.

a. .0063

b. .9624

c. .9937

d. .0376