When an ending to a story is unclear or uncertain, it's
a. ambivalent.
b. ambiguous.
c. realistic.
d. resolved.

When an ending to a story is unclear or uncertain, it's ambiguous. Option B is correct.

By beeing ambiguous, the ending of the story may be interpreted in different ways by the reader´s point of view.

An ambiguous ending, that is, and ending of a story that is not pretty clear, invites the reader to create his o her own opinion, and makes them arrive at his o her own conclusions based on the facts and events that were described and developed throught the whole story.

a conclusion based on evidence is an example of a. inference