【单选题】According to the text, civil rights activists maintain that one disadvantage under which minority-owned businesses have traditionally had to labor is that they have
A.
been especially vulnerable to government mismanagement of the economy.
B.
been denied bank loans at rates comparable to those afforded larger competitors.
C.
not had sufficient opportunity to secure business created by large corporations.
D.
not been able to advertise in those media that reach large numbers of potential customers.
【单选题】According to the fourth paragraph, one disadvantage of alliances foreseen by the critics is that air travel may be more expensive as a result of ______.