Mountain effect refers to the windward side of the mountain receiving precipitation. It is also the effect of rough terrain on radio-wave propagation. Thus, it caused reflections that produce errors in radio direction-finder indications.
I personally believe that the right answer is C. Other overpopulation results in more living organisms, and since the pollution has intoxicated the living, they die releasing the carbon into the soil. So there is high amounts of carbon and less of the organic compounds because the overdose on carbon.
Italy is surrounded by sea, meaning that there is always accessible trade routes through water. In earlier days, water trade routes became much more popular due to not having to travel through rough terrain. Therefore, the economy boosted as trade increased.
