Why did civilization flourish on the desert

this forms a narrow, steep sided inlet (sometimes deeper than 1300 metres) connected to the sea. the terminal moraine pushed down the valley by the glacier is left underwater at the fjord’s entrance, causing the water at the neck of the fjord to be shallower than the main body of the fjord behind it.

it was the first major victory for the colonists.

i would think the answer is between b and d i would say d sorry if wrong

if you could provide an excerpt for me to read i could