Concept:Identifying a verb in the passive voice, specifically when used with an infinitive phrase.Explanation:The sentence is: "We unlocked the door and entered our apartment. We were ______ shocked to find the whole place in disarray."We are looking for a verb that is in the passive voice. In English grammar, the passive voice is often formed using a form of the verb "to be" (like 'is', 'am', 'are', 'was', 'were') followed by the past participle of the main verb.Let's examine the options:A. 'find': This is a base form of the verb.B. 'unlocked': This is the past tense of the verb 'unlock'. The sentence "We unlocked the door" uses the active voice.C. 'entered': This is the past tense of the verb 'enter'. The sentence "We entered our apartment" uses the active voice.D. 'shocked': In the phrase "We were shocked", 'were' is a form of 'to be', and 'shocked' is the past participle of 'shock'. This structure indicates the passive voice, where the subject ('We') is receiving the action of being shocked. The phrase "to find" is an infinitive, and "shocked" describes the state of "We" when they were about to find the disarray.Answer:shocked