Final answer:
The Spanish word that best completes the sentence is 'doler'. It is used to express physical or emotional pain.
Step-by-step explanation:
The Spanish word that best completes the sentence is doler.
In this sentence, Nancy is going to feel the pain because of the flowers. The verb doler is used to express physical or emotional pain.
Por ejemplo: Me duele la cabeza (My head hurts), Me duele el corazón (My heart hurts).
Learn more about Spanish vocabulary