What Did George Kuh's Research Establish About Undergraduate Experiences That

What did George Kuh's research establish about undergraduate experiences that promote academic success and retention through graduation?

A) Students who are employed are less successful and persistent to finish their degrees.
B) Students who have a high-impact experience in the first year are more likely to be more successful and persist longer than those who don't.
C) Students who have a high-impact experience in their final year are more successful and persist through graduation.
D) The most successful and persistent students have a high-impact experience both in their first and last years of their undergraduate experience.