Nora Was Thinking About Something Else the Day Her Teacher

Nora was thinking about something else the day her teacher explained the difference between the words between and among, so she has trouble using these two prepositions correctly.Nora's difficulty "remembering" the difference between the two words can probably best be explained as:

A) failure to store in long-term memory.
B) failure to retrieve from long-term memory.
C) decay in long-term memory over time.
D) reconstruction error during retrieval.