The author' s attitude towards the three patterns of behavior mentioned in the passage is best described as one of ______.

A．They earn a reliable and comparatively high income.
B．They continue to work solely to meet the urgent needs of their family.
C．They enjoy the fellowship involved in working with other women.
D．They serve as models of behavior for others in the region.

A．political reasons
B．economic reasons
C．environmental reasons
D．developmental reasons