To find the value of z in the given code, let's break down the expression step by step:

1. x++ increments the value of x by 1 after it is used in the expression. So, the value of x is now 6.

2. --y decrements the value of y by 1 before it is used in the expression. So, the value of y is now -11.

3. y * b multiplies the value of y (-11) by the value of b (2), resulting in -22.

4. -22 / a divides the value of -22 by the value of a (4), resulting in -5.5.

5. Finally, z = 6 - (-5.5), which simplifies to z = 6 + 5.5. Therefore, z equals 11.5.

However, since the given variables are integers, the result will be truncated to the nearest integer. So, z will contain the value 11.

Therefore, the correct answer is option C) 11.

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