Answer:
Option A
Explanation:
From the classification of data, primary data is also known as the root of information, they are data's gotten from the horses mouth, if we are to classify how authentic they are. They are data's that explains true explanation that can't be neglected. It is from primary data that other information's and added on are gotten to become secondary data.
From the option above, option A is what explains what primary data is which is the right and best choice to the question.
 
        
             
        
        
        
Answer:
Voting rights for African Americans
Explanation:
The march was conducted in 1965, when protesters conducted a protest walk from Selma, Alabama  to Montgomery. The purpose of the march is to protest racial injustice in united states and demanded the government to allow the african Americans to exercise their right to be involved in the democracy. (at that time they were already allowed to vote, but the government still created some barriers that prevent them to do it)
This march lead to the creation of the voting rights act 1965, which designed specifically to address those voting barriers.
 
        
             
        
        
        
Answer:
The Answer to the question asked is a formal Piece of writing that is Published.
Explanation: Albert Einstein was a scientist during his era, because he was different in his reasoning and approach to science as regards to production of paper . In which other  scientists could not understand what he wanted achieve around the production of Paper that was why his work was published after his death .