Answer:
self-fulfilling prophecy
Explanation:
Self-fulfilling prophecy: In social psychology, the term self-fulfilling prophecy is referred to as one of the socio-psychological phenomenon that represents a particular notion in which an individual tends to expect or predict about something and later on this expectation or prediction turned out to be true just because he or she believes it to happen and therefore, the behavioral outcome satisfies those beliefs.
In the question above, the given statement is an example of the self-fulfilling prophecy.