According to the passage, pushing factors include the following EXCEPT______.

A．Migration of large numbers of people may cause conflict.
B．The newest arrivals can hardly get good jobs.
C．Native people often resent newest arrivals because they cannot communicate easily with the latter.
D．Usually it has taken several decades for each group of newest arrivals to be accepted into the mainstream of society in the host country.

A．are all related to economic considerations.
B．are not as decisive as push factors.
C．include a range of consideration.
D．are more important than push factors.