5. Why did Muslims raid towns in southern Europe?

Southern Europe was the closest set of people near them

Explanation:

At some point in the history of Europe, particularly around 711 AD, the Arab Muslims from the region of the Mediterranean or Iberian peninsula raided and amassed their first strong foothold in continental Europe, particularly in modern-day Spain and Portugal.

One of the main reason this was made possible was that the Muslims raid towns in southern Europe because Southern Europe was the closest set of people near them

i think the answer is c, rivers.

explanation:

sometimes, borders fall along natural boundaries like rivers or mountain ranges. for example, the boundary between france and spain follows the crest of the pyrenees mountains. for part of its length, the boundary between the united states and mexico follows a river called the rio grande. the borders of four countries divide africa’s lake chad: niger, chad, cameroon, and nigeria.

nuclear weapons are hoaxes. many people believe they are real, though.