The region where all of the light from the source is blocked is called:

Correct option is D

The correct answer is (d) Umbra.
· The umbra is the region of complete shadow where all light from the source is blocked by the obstructing object.
· This region is characterized by complete darkness and is the innermost and darkest part of a shadow.
· During a solar eclipse, for example, the umbra is the area on Earth where the Sun is completely obscured by the Moon .
Information Booster:
· Antumbra: The antumbra is the region where the light source is only partially obscured by the occluding object, and the observer can see a ring of the light source around the object. This occurs in annular eclipses.
· Shadow: The term "shadow" is a general term that refers to the area where light is obstructed by an object. It includes both the umbra and penumbra.
· Penumbra: The penumbra is the region of partial shadow where only part of the light source is blocked by the occluding object. It is lighter than the umbra and surrounds it.