Final answer:
The appropriate preterite form of the verb 'morir' is 'murió'.
Step-by-step explanation:
The appropriate preterite form of the verb 'morir' to fill in the blank in the sentence is OD. murió. The sentence translates to 'The poor woman died at eighty years old.' The preterite tense is used to describe completed actions in the past, and 'murió' is the third person singular form of 'morir' in the preterite tense.
Learn more about Spanish verb conjugation