Explanation:
it helps to increase trade relationship between nations of the world
The correct answer among all the other choices is A. the revival of democratic revolutions, and nationalism. This is a factor that caused German and Italian unification. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
The Europeans built roads, bridges, and railways in african colonies cause it helped them transfer or trade materials like gold, meat, supplies, etc... but now in this century it helps the african colonies with there transportations <span />
