B - agenda
An agenda is what the author really wants to point out (their underlying message) and it's typically written in a way where it's somewhat hidden. Example: political ads - they have an agenda for what they want to talk about and why it's important.
Answer and Explanation:
If we have a scaffold under construction, we will have an environment with some risks that must be combated, through guidelines that protect not only workers, but also people who are possibly passing through the site.
The construction of the scaffold leaves the environment dangerous because it can present risks of slips and debris falls, electrocution risk, risks of poorly prepared structure, among others.
The March on Washington for Jobs and Freedom was the largest civil rights protest in US history, and contributed to the successful implementation of the Civil Rights Act of 1964 and the Voting Rights Act of 1965.
