The sentence "When the fire alarm rang _______ left the building immediately" needs a pronoun or noun that can refer to people collectively. Here are the options provided:
- all
- everyone
- all the people
- every person
Analysis of the options:
- "all": Generally used with an uncountable noun or with plural countable nouns to mean "the whole number of" or "every one of". It is too broad in this context.
- "everyone": A pronoun used to refer to all the people in a group and fits perfectly in this context, emphasizing every individual in the group.
- "all the people": Although this option might fit contextually, it is less concise than "everyone" and typically specifies all people in a particular place or situation.
- "every person": Similar to "everyone" but less common in such contexts, particularly when speaking collectively about people leaving a place quickly.
Conclusion: The word "everyone" is the most suitable choice as it is concise and collectively refers to all the individuals without redundancy. Therefore, the correct sentence is: "When the fire alarm rang, everyone left the building immediately."