Why Are Marriages Against Vietnamese Social Norms Between Low-Wage Men

Why are marriages against Vietnamese social norms between low-wage men and high-education women becoming more common?

A) The marriage squeeze has resulted in too many men to women in the United States and too many women to men in Vietnam.
B) Women in Vietnam are becoming more educated in general and men find them attractive.
C) Working class men typically work long hours, meaning they have less time to select suitable partners.
D) Highly-educated Vietnamese women are marrying low-wage American men.