Even with the interconnectedness of industry, wherein an improvement in one area led to improvements in other areas, there was one dual foundation on which the rest was built; that foundation was:.

There was one dual foundation on which the rest was built; that foundation was: Speed and steam.

Explanation:

Industry was most beneficieted with the notions of speed, and the invention of steam. This dual foundation was the reason why industry could developed faster and also promoted transportation.

d is the correct answer

~courtney

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