The correct option is A Women were unlikely to work outside the home even in occupations whose hours were flexible enough to allow women to accommodate domestic tasks as well as paid labour.
The argument given in the passage is, since women were predominantly preferred for jobs at home as they were childbearing. Option (a) weakens the argument, as if women were given flexible working hours, then they would have been preferred for factory or non home works. Hence option (a) is the answer.