The correct answer here is the option B.
The March on Washington occurred August in the year 1963. The purpose of this action was to gather support for the passing of the Civil Rights act. About 250.000 people were a part of the march and it was during this ceremony that Martin Luther King Jr. delivered his famous I Have a Dream speech .
Where is the rest of the question
The answer is the the empire was conquered and exploited by Pizarro and other Europeans.
Within the next 2 to 4 months, the effects of the atomic
bombings in Nagasaki and Hiroshima have killed 39,000 to 80,000 people in
Nagasaki, and 90,000 to 146,000 people in Hiroshima. On the first day of the
bombing, almost half of the deaths in every city have occurred.
Answer:
A referendum is a public consultation that asks the opinion of the entire population on a subject.
Depending on the law that created the referendum it could be just a consultation, but most of the times it's a legal decision that forces the government to act according to the result of the referendum.
There was a good example lately that is still causing problems, the referendum on Brexit in 2016... the government had to act following the result, even though it wasn't its choice. And the issue isn't yet totally solved because no agreement has been reached yet, and it might lead to chaos and have great consequences for the UK.