Detailed Instructions: You are given a paragraph, a question and some answer options (associated with "A", "B", "C", "D", etc.) You need to list all the correct answer options with their associated letters (e.g. "A" can be a valid answer). Note that sometimes, more than one option can answer the question correctly and completely. In those cases, please generate all such options separated by a comma (e.g. "A, B" is a valid answer). Do not generate anything else apart from one or more of the following characters: 'A', 'B, 'C', 'D', etc.
Q: Paragraph- Sent 1: When a stream or river slows down, it starts dropping its sediments.
Sent 2: Larger sediments are dropped in steep areas.
Sent 3: Some smaller sediments can still be carried by a slow moving stream or river.
Sent 4: Smaller sediments are dropped as the slope becomes less steep.
Sent 5: Alluvial Fans In arid regions, a mountain stream may flow onto flatter land.
Sent 6: The stream comes to a stop rapidly.
Sent 7: The deposits form an alluvial fan.
Sent 8: Deposition also occurs when a stream or river empties into a large body of still water.
Sent 9: In this case, a delta forms.
Sent 10: A delta is shaped like a triangle.
Sent 11: It spreads out into the body of water. 
Question: What might you find when a mountain stream flows onto flatter land and comes to a rapid stop in arid regions? (A) Delta (B) Drop off (C) Sand bar (D) Alluvial Fans (E) Deposits.
A:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
D.