The correct answer to your question is A (Magna Carta)
Collective bargaining is a process of negotiation between employers and a group of employees aimed at agreements to regulate working salaries, working conditions, benefits, and other aspects of workers' compensation and rights for workers.
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One way is that those women could join the work force, and specifically, they could be a skilled work force - this would increase the competitiveness of the market. Basically, the number of the skilled workers would double (assuming no women are in the market in the beginning - that's a lot of new workers that would enrich the market!)
More educated women would also pay more attention to the education of their children, so their children would also more likely receive a better education - this would ensure that the economic growth is long-term.