Explanation:

Correct Option: (b)

• Cuspate Deltas  When a river reaches the sea, the fi ne materials it has not yet dropped are deposited at its mouth, forming a fanshaped alluvial area called a delta.
• Deltas differ much in their size, shape, growth and importance.
• On the basis of the shape, following are various types of Deltas:
•  Arcuate Delta is fan-shaped Delta.A bowed or curved Delta with the convex margin facing the body of water.Relatively coarse sediments are formed in this type of Delta. The river activity is balanced with the wind.Example, the River Nile Delta in Egypt and the Ganges Delta in India.
•   Cuspate Deltas is formed where sediments are deposited onto a straight shoreline with strong waves.
• The waves push the sediments to spread outwardly creating the tooth-like shape. Example, Tiber River of Italy.
•  Estuarine Delta is formed at the mouth of submerged rivers depositing down the sides of the estuary. Example, the Seine River of France, the Deltas of Narmada and Tapi (formerly Tapti) rivers of India.
•  Lacustrine Delta is formed when a river flows into a lake.Example, Lough Leanne river Delta, Ireland.
•  Truncated Delta: Sea waves and ocean currents modify and even destroy Deltas deposited by the river through their erosional work.Thus, eroded and dissected Deltas are called truncated Deltas.
•  Abandoned Delta: When the river shifts its mouth, the Delta already made is left abandoned.Such a Delta is called an abandoned Delta. Example, Yellow River Delta, China and the Western part of Ganga Delta made by Hoogly river, India.