The correct alternative is letter B. Brown v. Board of Education of Topeka, in 1954, was a very well known case judged by the Supreme Court of the United States which has decided to be unconstitutional all racial segregation in public schools in the United States. This decision has overturned a previous decision of 1986, in the Plessy v. Ferguson which had validated racial segregation in public areas in the US, such as schools, hospitals and bus and train stations.
You can apply that we all need to be much more careful and to stay positive we can also try not to touch everything, because I know before corona virus I used to touch everything.For example I used to touch everything at the stores. Clothes, railways, unnecessary walls and the counters. Know I just don't touch anything.
Hope this helped.
