The only contents of a container are 10 disks that are each numbered with a different positive integer from 1 through 10

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The only contents of a container are 10 disks that are each numbered with a different positive integer from 1 through 10, inclusive. If 4 disks are to be selected one after the other, with each disk selected at random and without replacement, what is the probability that the range of the numbers on the disks selected is 7 ?

A) 1/7

B) 3/14

C) 2/7

D) 1/2

E) 15/28