The practice of describing mixed-race ancestry in fractions, as ¼ this race and ¼ that race, for instance, is
a. a legacy of now discarded biological ideas of race.
b. an accurate and convenient way for mixed-race people and others to think of multi-racial identity.
c. a legitimate form of self-identification according to U.S. Census categories.
d. an accurate shortcut for referring to the hereditary genetic contributions of a person’s ancestors.