How does an author use cause-and-effect relationships to drive the plot of a story?

A. There is always just one possible result of a character's action. An author uses this fact to drive the plot as the reader wonders what that one possibility is.
B. There are often many possible results of an action. An author uses this fact to drive the plot as the reader wonders what that result will be.
C. There are always two possible results of a character's action. An author uses this fact to drive the plot as the reader must decide which of these two choices will result.
D. There is always one possible cause of an effect. An author uses this fact to drive the plot as the reader wonders what that one possible cause was.

Question

How does an author use cause-and-effect relationships to drive the plot of a story?

A. There is always just one possible result of a character's action. An author uses this fact to drive the plot as the reader wonders what that one possibility is.
B. There are often many possible results of an action. An author uses this fact to drive the plot as the reader wonders what that result will be.
C. There are always two possible results of a character's action. An author uses this fact to drive the plot as the reader must decide which of these two choices will result.
D. There is always one possible cause of an effect. An author uses this fact to drive the plot as the reader wonders what that one possible cause was.