Offering ____________is the most powerful strategy adopted by persistent grand-childless parents.

A．Fred likes the beautiful scenery along the way to Canada.
B．Fred usually flies to Canada with Jane.
C．Fred persuaded Jane to change her mind.
D．Fred is planning a trip to Canada.

A．They were looked down upon by European immigrants.
B．They had a hard time seeking equal job opportunities.
C．They worked very hard to earn a decent living.
D．They strongly opposed continued immigration.