In each of the following sentences, some part or the entire sentence is quotation. According to a recent study, financial problems, together with their serious ramifications, 'ranks as one of the high causes of marital stress'.
A. ranks as one of the high causes to marital stress
B. rank as one of the leading causes of marital stress
C. rank as one of the most high causes of marital stress
D. ranks as one of the leading causes of marital stress
