Which of the following is formed as a result of a rockfall A
a delta
B
a sand dune
C
a talus slope
D
an alluvial fan

C a talus slope

Explanation:

A rockfall consists of rock  falling down steep slopes and cliffs.

The rock fragments found at the feet of the slopes are called talus or a talus slope.  

A is wrong. A delta is formed from the sediment carried by a river.

B is wrong. A sand dune is a hill of loose sand formed by the action of wind or water.

D is wrong. An alluvial fan is a triangle-shaped deposit of water-transported gravel, sand, and silt.

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