单项选择题

Americans view friendship more tentatively, subject to changes in intensity as people move, change their jobs, marry, or discover new interests.

A.Americans don’t think that friendship can and should remain unchanged.
B.Americans think that in this changing world no friendship can stay stable.
C.Americans prefer anything new and they are constantly looking for new things including friends.
D.Americans look upon friendship as temporary; they don’t believe there can be true friends.