[单项选择]There is little question that substantial labor-market differences exist between men and women. Among the most researched difference is the male-female wage gap. Many different theories aroused to explain why men earn more than women. One possible reason is based on the limited geographical mobility of married women [Robert Frank, 1978]. Family mobility is a joint decision in which the needs of the husband and wife are balanced to maximize family welfare. Job-motivated relocations are generally made to benefit the primary earner in the family. This leads to a constrained job search for the secondary earner, as he or she must search for a job in a limited geographic area. Since the husband is still the primary wage earner in many families, the job search of the wife may suffer. Individuals who are tied to a certain area are labeled "tied-stayers," while secondary earners, who move for the benefit of the family are labeled "tied-movers" [Jacob ～Mincer, 1978].
The wages of a tied-sta
A. the way in which Americans tend to move from job to job.
B. the penchant wage-earners have to maximize family welfare.
C. the necessity to relocate in order to increase wages.
D. all of the above.
E. none of the abov

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