Which equation represents a function of x that is not linear?

Which best describes why web dubois and booker t. washington's approaches to and strategies towards civil rights were so different? a.washington faced minimal and mild discrimination as he was raised in a prominent family in the north. dubois faced harsh discrimination, restrictions from jim crow laws, while growing up in the post-reconstructed south. b.dubois was fortunate enough to have parents who were well involved in politics, rising from smaller government positions to higher federal positions, while washington was raised by uneducated and politically excluded slave parents. c.washington was unwilling to speak out publicly, which restricted the audience he reached, thus the support he gained, while dubois spoke eloquently to small and large audiences, thus able to gain more personal and monetary support. d.dubois was born in the north, earned his doctorate from harvard, after having scholarships from other prestigious institutions, while washington was born a southern slave, and his determination allowed him to gain education and respect as a leader.