What this picture is depicting is that the United States president has created a wall that would stop Europeans from having access to the country.
<h3>How is the policy discouraging immigrants shown here?</h3>
From the picture, a high wall can be seen that has the name Joe on it. Joe would be the current president of the United States.
The other side of the wall has Europeans out of it. These people are those that want to enter the country but cant.
Read more on immigrants here: brainly.com/question/5139857
Alfred Marshall is credited with first using cost-benefit analysis. The correct option among all the options given in the question is option "b". The actual fact is that the concept was first brought into existence by Jules Dupuit in an article in the year 1848. His concept was first put to work by Alfred Marshall later on.
"The Watergate scandal began early in the morning of June 17, 1972, when several burglars were arrested in the office of the Democratic National Committee, located in the Watergate complex of buildings in Washington, D.C. This was no ordinary robbery: The prowlers were connected to President Richard Nixon’s reelection campaign, and they had been caught wiretapping phones and stealing documents. Nixon took aggressive steps to cover up the crime afterwards, and in August 1974, after his role in the conspiracy was revealed, Nixon resigned." -source https://www.history.com/topics/watergate