Based on the quota established by the Immigration Act of 1924, it can be concluded that strict quotas were indeed placed on immigrants coming from eastern and southern Europe. The Option D is correct.
The Johnson-Reed Act aimed to limit immigration from certain regions by imposing stringent nationality-based quotas. It did so by setting a maximum number of immigrants allowed from each country based on the percentage of that nationality's population in the United States according to the 1890 census.
This had the effect of significantly reducing the number of immigrants from eastern and southern European countries as the 1890 census data favored immigrants from northern and western Europe.
Consequently, it was clear that the Immigration Act of 1924 was designed to restrict and regulate immigration, particularly from certain parts of Europe.