Final answer:
The preterite form of the verb 'dormir' is 'dormí'.
Step-by-step explanation:
The correct answer is OB. dormí. The sentence is in the past tense, so we need to choose the preterite form of the verb 'dormir', which is 'dormí'. The sentence translates to 'Last night I stayed at Ana's house and I slept on the couch'.
Learn more about the preterite form of the verb 'dormir'