The correct answer to this open question is the following.
Although there are no options attached, we can say the following.
President Lyndon Johnson began his career as a teacher at a small school in Cotulla (near San Antonio). At the school, he worked with young Mexican American students from struggling families. This experience influenced his ideas in many ways.
For instance, this early experience in his career helped him to be sensitive to the necessities of other people, particularly of minority groups such as African Americans and Hispanic people.
This experience made him strongly support education in the United States. When became the United States President after the assassination of Jonh F. Kennedy, Johnson signed the Elementary and Secondary Education Act of April 1965.
Another important consequence of that above-mentioned experience as a teacher in San Antonio was that he understood the condition of minority groups and supported the signing of the Civil Rights Act of 1964.