A Disproportionate Share of Eurobonds Have High Credit Ratings in Comparison

A disproportionate share of Eurobonds have high credit ratings in comparison to domestic and foreign bonds.(Approximately 40 percent of Eurobond issues are rated AAA and 30 percent are AA) .Explanations for this include

A) the issuers receiving low credit ratings invoke their publication rights and have had them withdrawn prior to dissemination.
B) the Eurobond market is accessible only to firms that have good credit ratings and name recognition to begin with; hence,they are rated highly.
C) there is "grade inflation" on the part of the bond rating agencies which are paid by the issuers and have to compete for business.
D) the issuers receiving low credit ratings invoke their publication rights and have had them withdrawn prior to dissemination,and the Eurobond market is accessible only to firms that have good credit ratings and name recognition to begin with; hence,they are rated highly.