What is the main ethical issue with the credit rating agencies (if any) as presented in the movie? (Please answer this question according to THE BIG SHORT MOVIE . )

Select one:

a. They were reluctant to change the credit ratings of the bad CDOs, in the fear that the underwriters of these securities would go to other credit rating agencies (competitors), from which they can get better ratings.

b. The credit rating agencies were involved in a bribery scandal; the CEO of a major credit rating agency has received monetary benefits in exchange of favorable ratings on their CDOs.

c. They were actively involved in shorting the CDOs that lead to the collapse of the market.

d. The credit rating agencies were not involved in any unethical behavior prior to/during the financial crisis of 2008.