Question

in northern europe, many reclaimed polders, such as the one in the photo above, are created by systems of that have been built to hold back water. a. fjords b. foehns c. siroccos d. dikes

Explanation:

Fjords are long, narrow inlets with steep sides or cliffs, formed by glaciation. Foehns are warm, dry winds on the leeward side of a mountain range. Siroccos are hot, dry desert - origin winds. Dikes are embankments built to hold back water, and polders in northern Europe are created by dike systems.

Answer:

D. dikes