Six second grade students tried tossing a ball into a basket ten times each. Their teacher then suggested a different way of tossing the ball, and the six students tried again. The number of successful tosses, before and after the teacher's added instruction, are shown below.

Student

A

B

C

D

E

F

Before the suggestion (out of 10)

7

4

7

4

7

4

After the suggestion (out of 10)

3

4

3

6

3

4

Find the signed rank of child A's difference. [Recall, differences of zero are not ranked.]

Question options:

+3

+3.5

+4

+5