Astoryboard is
a.
a visual series of rough drawings depicting the scenes of action in a story.
b.
a transparent sheet of film on which objects are drawn or painted for traditional hand drawn animation.
c.
a visual series of sections of captured images on clear film.
d.
an animation technique to make a physically manipulated object appear to move on its own.

A- Visual series of rough drawings depicting the scenes of action in a story.

Explanation:

A storyboard is a visual series of rough drawing which is usualy depict the scenes of action in a story and how the story will play out scene by scene. It's made up of a series of images.

They usually looks like a comic strip of someone plan and can be incredibly simple to put together.