John is involved with a project studying intelligence. During the study, he is first asked to name the state capitals of Wisconsin and Hawaii. Then he is asked to explain the difference between the words "destiny" and "density". Given these tasks, John appears to be taking a test of intelligence.

In the years after world war ii, which of the following caused many people from asian and african countries to migrate to europe? a. the end of the soviet union b. new economic opportunities after colonialism ended c. the religious freedom found in europe d. new laws allowing greater numbers of immigrants into european countries