Final answer:
The mood of the verb 'walked' in the sentence: 'Mrs. Lopez walked into the room.' is indicative. This mood is used to express facts, opinions, or questions.
Step-by-step explanation:
The verb 'walked' in the sentence, 'Mrs. Lopez walked into the room.' is in the indicative mood. Grammatical moods reflect the speaker's attitude towards the action stated by the verb. The indicative mood indicates a factual situation; it states or expresses a fact, opinion, or question. In the given sentence, 'walked' simply states a fact about Mrs. Lopez's action, hence it is indicative.
Learn more about Indicative Mood