When Gladys, Who Was Hard-Of-Hearing, Attended Her Grandson's Graduation, She

When Gladys, who was hard-of-hearing, attended her grandson's graduation, she devoted an inordinate amount of energy to just listening and trying to make sense of what she was hearing. Consequently, the next day, when her girlfriend asked her what the celebrity guest speaker spoke about, she could not remember. Gladys's failure to encode the speech into her memory is best accounted for by which explanation?

A) Inhibition-deficit
B) Recollection-deficit
C) Sensory-deficit
D) Processing-resources-deficit