39. According to the passage, which of the following statements about the Arab world is TRUE?
(A) Religious groups are commonly in alliance with non-religious ones and thus secure their political domination.
(B) The development of the private section has been deliberately and relentlessly obstructed from the Middle Ages to the present.
(C) Governments of the affluent countries in this region rely on their rich oil reserves to generate sufficient revenues to maintain their political sovereignty.
(D) Building a modem，resilient economy may be a facilitator to the liberation of political development in those autocratic Islamic countries.