Answer:
It would be letter A
Step-by-step explanation:
The cause would be that Brianna wanted to have a house by the sea. Sh efound out that warmer water attracted dolphins so she chose a spot that was perfact a few feet from the dunes. The effect would be that since it was so close to the water the spray of the ocean could reach the house causing it to crumble away over time.
I hope this helps