The map above most clearly reflects which of these developments of the time period?

a) the movement of peoples caused environmental and linguistic effects.
b) there was continued diffusion of crops and pathogens, including epidemic disease.
c) improved transportation technologies and commercial practices led to an increased volume of trade.
d) cross-cultural exchanges were fostered by the intensification of existing, or the creation of new, networks of trade and communication.

I would say D. Cross-cultural exchanges were fostered by the intensification of existing, or the creation of new, networks of trade and communication.

Explanation:

A. Is wrong because it does not show the movements of peoples, on the map it says trade routes

B. Is wrong because it does not show epidemic disease, on the map it says trade routes

C. I think this is wrong because it shows it before increased volume of trade, the map says post-classical

D. I believe it is this because it is very much cross-cultural and it does show many new networks of trade

what are local authorities doing to fix the problem

explanation:

d) a constitutional amendment