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v02-l2-findError

What line does not produce a compilation error

void doSomething(double& x) {
    // ...
}

int main() {
    double* x_ptr = new double(4);

    // line A
    doSomething(x_ptr);

    // line B
    doSomething(*x_ptr);

    // line C
    doSomething(&x_ptr);

    return 0;
}

???