B)    2    and    4
 

                                    1.    The opening up of new fur-trading territories
        Correct               2.    The adoption of policies that promoted a higher birth rate
                                    3.    The establishment of more fur-trading companies
        Not Correct        4.    The arrival of large numbers of French Protestants
                                    5.    The implementation of policies that promoted immigration

     Hint ! How do you -    "INCREASE POPULATION GROWTH"