A battery is charged. The percentage of the battery's capacity that is charged as a function of time (in minutes) is graphed.
graph
5
5
10
10
15
15
20
20
25
25
30
30
10
10
20
20
30
30
40
40
50
50
60
60
70
70
80
80
90
90
100
100Time (minutes)Capacity (% charged)
At what rate is the battery charged?
Choose 1
Choose 1

(Choice A)
A
2
22 percent per minute

(Choice B)
B
1
11 percent per minute

(Choice C)
C
10
1010 percent per minute

(Choice D)
D
20
2020 percent per minute