The answer is D, sedimentary.
The answer is D.
I hope this helps. :)
Similarities :Both alluvial fans and deltas deposit sediment.
Difference:
A delta forms when a river empties into a larger body of water. An alluvial fan forms on land where a river emerges from a mountainous area and flows out onto a more gently sloping plain. The decrease in slope causes the river to decelerate and deposit sediment, forming an alluvial fan.
The warm air that comes in Vietnam during the rainy season is most likely from the Pacific Ocean. In fact, tropical storms that pass over Vietnam form over the Pacific Ocean when the water warms up. The Pacific Ocean is at its warmest from June to November and the warm air and typhoons move inland over Vietnam.
