What factors make it difficult for eastern europe to improve its water quality?
eutrophication
greenhouse gases
outdated sewer systems
raw water quality
unskilled employees
worn-out water utilities

The factors that make it difficult for Eastern Europe to improve its water quality are: outdated sewer systems , raw water quality , unskilled employees , worn-out water utilities.  

The majority of countries in Europe do have safe drinking water. However, there are few where you'll need to take precautions and some other, where you'll want to avoid drinking water In general, Western Europe has safe tap water but Eastern Europe is a place to be wary of the water.

answer; (b) they could make more trips;

well this is going to be a long answer lol ok so the visigoths were a branch of the goths who frequently raided rome, uh the hunas attacked the guptas a lot and weakened them, uuhm of course the romans used math and science in there every day lives i mean they had a whole empire to run, and rome was split into east and west by a general named diocletian. hope this you! : )