The increase in the numbers of married women employed outside the home in the 20th century was NOT due to ______.

A．Mechanization of work has little changed the conditions of women.
B．Mechanization revolutionizes a society's customary roles of its members.
C．Mechanization of Work creates new jobs that did not exist previously.
D．Women's work has changed considerably in the past 200 years.

A．humans are responsible for the problem
B．hunting limits and regulations should be lifted
C．birds have a strong capability to survive
D．the Canada geese are a better species than the snow geese