If we needed the number of pages, why is this code in Book.cpp wrong?
```
void GetPages() {return num_pages;}
```
A. GetPages() is not passed a variable.
B. The code is okay, the program returns the int intuitively.
C. it won’t compile, new_pages is an undeclared identifier.
D. The code is perfect.
C. it won’t compile, new_pages is an undeclared identifier.
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