Helen Proposed a New Theory of Child Development

Helen proposed a new theory of child development.Using this theory,she has successfully described and explained past behaviours but she is unable to predict or explain new observations.How should Helen's theory be categorized?

A) It is a superior theory because it describes and explains past behaviour, which is more than most theories do.
B) It is a weak theory because it cannot generate new research.
C) It is an adequate theory because it may have some minor flaws, but in general it is good.
D) It is a weak theory because if it doesn't predict or explain new observations, it is of little value.