The provided passage describes how organised labour has evolved over time. Historically, labour relied heavily on its economic power, favouring direct economic actions such as strikes. However, the text highlights a shift towards valuing logic, facts, and moral righteousness. Organised labour is increasingly inclined towards resolving issues through harmonious means rather than conflict. This can be inferred from the statement: "More and more organised labour is coming to believe that its best interests are promoted through concord rather than by conflict."
The option that accurately reflects this evolution in strategy and approach of organised labour is: "It prefers the conference table to the strike field." This option indicates a preference for negotiation and dialogue over confrontational tactics like strikes, aligning with the passage's portrayal of modern organised labour's values.