What will be the output of the given C++ code?

#include <bits/stdc++.h> 
using namespace std; 
int main() 
{ 
    int arr[] = {1, 3,4,2,5}; 
    int n = sizeof(arr)/sizeof(arr[0]);   
    sort(arr, arr+n); 
    int a;
    for ( a = 0; a< n; a++) 
        cout << arr[a] << " ";  
    return 0; 
}

A. 1 2 3 4 5

B. 1 3 4 2 5

C. 5 4 3 2 1

D. error

Answer: Option A