People with a college education:

a. have increased personal and professional mobility.
b. save less money because they have more to spend.
c. are incarcerated at a higher rate.
d. are always more successful than those without one.

A.have increased personal and professional mobility.

Explanation:

Although a college education does not guarantee in any way a higher success rate in life (measured in economic, social, personal or self-realization standards), it does guarantee a greater personal and professional mobility. This is because a college education, ideally, immerses students in different topics and provides the possibility to learn various skills that can be employed for diverse personal and professional enterprises.  

where is the

the third one.

hope it