Why is one condition on line 4 “i is greater than -1”?
```
1 for each j, from 1 to the length of A – 1
2 temp = A[ j ]
3 i = j – 1
4 while i is greater than -1 and A[ i ] is greater than temp
5 A[ i + 1 ] = A[ i ]
6 i—
7 A[ i + 1] = temp
```
A. -1 is not a valid index of an array
B. if i has been set to -1, it means the array is already sorted
C. if i is -1, we cannot do any more one-assignment swaps, so we must exit the loop
D. if i is -1, it means the array cannot be sorted
C
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