Answer:
Option a. Sarah Walker known as Madam C.J Walker was the first American woman to earn more than $1 million, making her the first female millionaire in the United States.
Step-by-step explanation:
Born in Louisiana on December 23rd, 1867, Sarah Breedlove, known as Madam C.J Walker was an African-American entrepreneur, philanthropist and political and social activist, that became the wealthiest self-made woman in the United States, and the first ever millionaire of the country. Her fortune came mainly from a line of cosmetics and hair products she developed for African American women.