What is the value in x after line 6 is run?
```
1 string s, t;
2 s = “Get up and go to school!”;
3 t = “NO!”;
4 int n = s.size();
5 int w = s.at(3);
6 int x = s.at(12);
7 s += t;
8 cout << s;
```
A. g
B. o
C. space ‘ ‘
D. s
B
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