Answer:
a.The Greenberg interview provides an insider's view of the Brown vs. Board of Education case; the perspective of the informational article is more distant.
Step-by-step explanation:
Brown vs. Board of Education is a famous case based on a fight against racial segregation of white and nonwhite kids going to separate schools. Supreme Court decided that education in separate schools is unconstitutional.
Greenberg was one of the lawyers that participated in winning this case against Board of Education. His interview included relevant first-hand information about the case and its participants. Informational article on Thurgood Marshall is based on research and on this interview. So option A is correct.