According to a recent study, fifteen corporations in the United States that follow a credo of social responsibility are also very profitable. Because of their credos, these fifteen corporations give generously to charity, follow stringent environmental-protection policies, and have vigorous affirmative-action programs.
Which of the following can be correctly inferred from the statements above?
(A) Following a credo of social responsibility helps to make a corporation very profitable.
(B) It is possible for a corporation that follows a credo of social responsibility to be very profitable.
(C) A corporation that gives generously to charity must be doing so because of its credo of social responsibility.
(D) Corporations that are very profitable tend to give generously to charity.
(E) Corporations that have vigorous affirmative-action programs also tend to follow stringent environmental-protection policies.
答案是B，C为什么不对呢

试解答如下：
C：IF company has credo of social responsibility, THEN it must give generously to charity.
I can not find the "if.. then.." structure in the passage. Moreover, if fifteen companies do, that does not mean all companies do.
The only logical word I found is "ALSO", so B "it is possible..."