Fourteen-Year-Old Beverly and 10-Year-Old Ben Are Doing Their Homework

Fourteen-year-old Beverly and 10-year-old Ben are doing their homework. Beverly asks Ben if he minds if she turns on the radio while they work. Ben tells her he doesn't mind. Although Beverly can sing to the radio and do her homework at the same time, Ben is having trouble focusing on his homework. This situation is best explained as which of the following?

A) Beverly has a larger STM than Ben.
B) Ben has problems concentrating and focusing mental resources.
C) Ben has a smaller LTM than Beverly.
D) Ben has automatized listening to the radio and studying and Beverly has not.