Final answer:
Without further context, it is impossible to determine the correct number of pianos Nellie bought on her shopping spree among the provided options. The question lacks the necessary information for a definitive answer.
Step-by-step explanation:
The question "Nellie went on a shopping spree and bought ___ pianos." appears to be missing some context that would allow us to determine the correct answer between the given options: A. 13 pianos, B. 10 pianos, C. 5 pianos, D. 2 pianos. Since additional details such as a story or data set are not provided, it is impossible to definitively answer without guessing.
However, piano shopping sprees can be related to one's passion and experiences with musical instruments, such as learning to play piano at an early age or memorizing the location of the keys. Such literacy experiences in music can potentially encourage individuals to invest heavily in musical instruments.