Forcing transgendered people to change at any age is usually futile, and could increase rather than alleviate any trauma the boy feels regarding his identity. However, given the difficulties the boy may experience in the future, encouraging the parents to get the boy counseling, without labeling the boy as 'abnormal' would be a wise step.

Part B

The reasons that individuals identify with opposite-gendered behaviors and physicality are not clearly understood, even by the individuals themselves. Adults who select sexual reassignment surgery often say that they never felt as if they could express their true selves, before surgery. However, in the case of this young boy, it is uncertain whether he will select such surgery in the future. His character is still unformed.

Given the age of the boy, it would...

Even if hormone imbalances or biologically-based reasons are at the root of his condition, no type of physical remedy will 'cure' the boy, nor will forcing him to dress or behave in a more conventionally masculine fashion.
Part C

The reasons that individuals identify with members of the other gender are uncertain. It is not clear if the boy can or should be 'treated' -- however, counseling and support will make whatever he experiences in life, or whatever he chooses in the future easier to bear. For a young child, engaging in play therapy, or having a 'safe space' to talk about his feelings might be the most valuable treatment the counseling profession has to offer him at this time.