It made production quicker
Factories? Im not very sure because this is kinda vague. but hopefully you can get it!
I think A.
The most remarkable feature of Harappan civilisation was its urbanisation. The Harappan places which were small towns, show an advanced sense of town planning. ... System town planning, drainage system, granary, dockyard, public bathing place, use of bricks, buildings, etc.
Yes, the answer is D) to control all German-speaking nations. Hope this helps anyone out there. :)