Recognizing the shortage of time available to spend with their children, working, mothers sometimes take ______ in the concept of "quality time".

A．they are cliches, repeated too often by scientists
B．they are almost always proved to be wrong by later scientific research
C．they are mocked at by later generations
D．they provide material for good comedies

A．John Bunyan’s Pilgrim’s Progress and one of its characters "Muckrakers"
B．its function of cleaning the dirt off the floor in public places
C．its relentless exposures of political and social evils
D．its indispensable status to the well-being of society