Answer:
b. a cultural label invented by human beings to sort people into groups
Explanation:
The concept of 'race' has been around for hundreds of years. However, as we evolve, our definition of race has changed and evolved as well. In general terms, race is defined as a grouping of individuals that are separated in regard to their cultural and physical features.
By the early twentieth century, researchers -anthropologists and biologists- proposed that race was actually a concept invented by humans or, in other words, a social construct with the purpose of separating people into groups based mainly in their physical similarities or differences.