Fill in the blank with the correct option.

Most of the guests arrived for the concert _____ bus.

The correct option is by.

Step-by-step Explanation:

1. Analyze the sentence structure: The sentence is "Most of the guests arrived for the concert _____ bus." We need to find the preposition that correctly connects the verb phrase "arrived" (expressing movement or travel) with the vehicle/mode of transport "bus".

2. Understand preposition usage with transportation: In English, we use the preposition by followed directly by a noun (without any articles like "a", "an", or "the") to describe the mode, means, or method of travel. For example: by bus, by car, by train, by plane, or by boat.

3. Evaluate the other options:
- with: This preposition usually implies accompaniment or using an instrument/tool (e.g., "written with a pen" or "traveling with a friend"). It is grammatically incorrect to say "arrived with bus".
- from: This indicates a starting point or origin (e.g., "arrived from Chicago"). It does not describe the method of transportation in this context.
- through: This suggests moving within or from one side to the other of a space (e.g., "drove through the tunnel"). It is not used to state the mode of transport.

4. Conclusion: The preposition by correctly completes the phrase "by bus" to indicate the method of travel used by the guests to reach the concert.