Travis is a high school teacher. He has the same group of students for a semester and then gets a whole new group of students the next semester. He notices that when he gets the second group of students, he has difficulty learning their names because he is so used to the names of his last semester students. Travis is experiencing _____.

a) proactive interference
b) anterograde amnesia
c) retrograde amnesia
d) retroactive interference

Answer: a