People cast a shadow on the ground as they walk because they block the light.

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Solution

The correct option is B Light
A dark region is formed on a screen when an opaque object comes in between the path of light and a surface. It is called as a shadow. Human body is opaque and thus people cast a shadow on the ground as they walk around in sunlight.

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Similar questions

___ objects allow light to pass through them, they cannot form a shadow.

A block of wood was placed in the path of light. It completely blocked the light to form a shadow. This is because wood block is ____.

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