单选题

Which of following C++ code is correct?

Question

A. int f() { int *a = new int(3) return *a }

B. int *f() { int a[3] = {1, 2, 3} return a }

C. vector<int> f() {vector<int> v(3) return v }

D. void f(int *ret) { int a[3] = {1, 2, 3} ret = a++ return }