Carl and Ursula Are Taking a Second Language Course and They

Carl and Ursula are taking a second language course and they study together. Each week Carl and Ursula study their new vocabulary words by generating another associated word and a short one-sentence memory that involves the word. Last week Carl and Ursula decided to cut down on the amount of preparation that they each did by taking turns generating the cues for the vocabulary words. When Carl used Ursula's notes to study that first week, he did not do well on the exam because:

A) self-generated cues maximize recall
B) Ursula's associations were not good links
C) multiple retrieval cues interfere with recall
D) his routine for studying had been disrupted