The underlined word "blurred" in the 3rd paragraph most probably means ______.

A．dating is the common practice for young people who intend to marry
B．dating generally follows a stage of "steady dating"
C．"steady dating" is sometimes followed by courtship
D．marriage is the inevitable outcome of courtship

A．Mate selection is exclusively based on love.
B．Mate never refers to the person whom one intends to marry.
C．Economic factors are rarely taken into consideration in mate selection.
D．To nontraditional people mate is more than a person’s intended spouse.