If you could please include the phrases, you could get a more defined answer.
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The answer is B. Lake Victoria. If you look at a physical map of Africa, you will get this answer. The Great Rift Valley is through the center of Djibouti. The Indian Ocean is east of INDIA, not even close to Africa. I hope this helps!
It states that layers of sediment are originally deposited horizontally due to the effects of gravity.