What is the shape of the Barchans?
(A) Circular
(B) Rectangular
(C) Crescent
(D) Square

Hint: Barchans are dunes. It is also known as barkhan dune. Barchans face the breeze, seeming raised, and are created by wind activity prevalent from one heading. Marine barchan rises seem submerged as sands move their way across the seabed.

Complete answer:
Barchan is crescent-shaped dunes. Barchans face the breeze, seeming raised, and are created by wind activity overwhelmingly from one bearing. They are a typical landform in sandy abandons everywhere on the world and are bend formed, uniquely unbalanced in cross-area, with a delicate incline looking toward the breeze sand edge, involving all around arranged sand.
This sort of dune has two "horns" that face downwind, with the more extreme incline known as the slip face, confronting ceaselessly from the breeze, downwind, at the point of rest of the sand being referred to, around 30–35 degrees for medium-fine dry sand. The upwind side is stuffed by the breeze and stands at around 15 degrees. Barchans might be 9–30 m (30–98 ft) high and 370 m (1,210 ft) wide at the base estimated opposite to the breeze.
Simple barchan dunes may show up as bigger, accumulated barchan or megabarchan rises, which can steadily move with the breeze because of disintegration on the windward side and statement on the leeward side, at a pace of relocation going from around one meter to 100 meters for each year. Barchans typically happen as gatherings of segregated rises and may frame chains that reach out across a plain toward the overall breeze. Barchans and uber barchans may blend into edges that stretch out for many kilometers.
The cycle shows up cursorily like floods of light, solid, or water that go straightforwardly through one another, yet the nitty-gritty system is altogether different. The rises copy soliton conduct, however dissimilar to solitons, which course through a medium leaving it undisturbed (consider waves through water), the sand particles themselves are moved.

Thus, option (C) is the correct answer.

Note: As barchan rises move, more small ridges outperform bigger rises, making up for the lost time at the back of the bigger rise and ultimately seem to punch through the huge dune to show up on the opposite side.