Perhaps the best way to approach this question is to use a process of elimination. From the picture, it is quite evident that it does not look like a bird's foot (C) delta as shown below. A bird's foot delta forms where sediment is deposited in relatively calm offshore waters. An example of a bird's foot delta is the Mississippi river delta.
bird's foot delta
Furthermore, it does not resemble an arcuate delta which is bow shaped (D) and has a number of distributaries flowing across the delta (eg the Nile delta). An arcuate delta forms when a river meets the sea in a place where the waves, currents, and tides are strong.
A cuspate delta (A) is formed when a river drops sediment onto a straight shoreline with strong waves. Waves force the sediment to spread outwards in both directions from the river's mouth making a pointed tooth shape with curved sides. An example is the Tiber delta in Italy. The picture in the question does not look like a tooth.
Hence, the option remaining is estuarine (B) such as the Seine river delta in France. When the mouth of a river enters the sea and is inundated by the sea in a mix with freshwater and very little delta, it is called an estuary.