What Does the Case of Alexina Morrison, an Escaped Slave

What does the case of Alexina Morrison, an escaped slave who was taken in by a White family and sued to legally obtain her freedom, reveal about racial classifications?

A) Race is a scientific categorization determined by biological characteristics.
B) Race can only be determined through birth records and other legal documents.
C) Race is a socially constructed category.
D) Race follows tight, logical rules of classification.