Answer: A) Post-conventional
Explanation:
Post-conventional in terms of Kohl berg's theory is defined as the stage where a person tends to have abstract and conceptual morals and values .This makes them believe that some regulation and laws are not just and fair so they should be removed or changed accordingly.
According to the question, Tapi is displaying the stage of post-conventional moral thinking as she thinks that the regulation regarding interracial marriage in her country is not fair and proper. Thus, she is displaying abstract principle of her own.
Other options are incorrect because pre-conventional stage is where the person morality is controlled externally.Conventional stage is the level where morality deals with the society and own-self.Thus, the correct option is option(A).