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

A．A Survey of Three Mexican American Families at Work in Texas.
B．Innovative Career Women: Effects on Family Unity.
C．Changes in the Lifestyles of Migrant Mexican-American Families.
D．Farming of Family: The Unavoidable Choice for Migrant Farm Workers.

A．they migrate for part of each year
B．they spend less time contributing to family income
C．they spend more months on school
D．their parents sometimes work at jobs other than farming