问题
                    
He told me to leave out the articles inthis sentence ________ it is possible
                            A:Besides, top collegesare facing changes in the population
B:What contributes toit
C:But a mistake can becostly if it happens
D:Take it easy
                        
                        B:What contributes toit
C:But a mistake can becostly if it happens
D:Take it easy
正确答案是: