B

Uncertain value

The first double for loop assigns values ??to the nine elements a00 a01 a02 a10 a11 a12 a20 a21 a22

After Sun Huan finished, j = 3

When doing the accumulation, the values ????of a03 a13 .... a73

were accumulated, and these elements were not assigned.

For initialization values, different compilers have different approaches. Some assign values ??to 0, some assign values ??to 0xcc, and some assign them to random numbers directly.

So the accumulated value is also uncertain