Which of the following is an example of an effective subject line for a professional email?

An effective subject line for a professional email should be clear, concise, and informative, allowing the recipient to quickly understand the main purpose of the email. The choice that communicates specific information about a meeting—indicating that it has been rescheduled and providing the new time—achieves this. This type of subject line helps the recipient prioritize their response and ensures they are aware of the schedule change, which is particularly important in a professional setting where time management is key.

The other options, while they convey some level of urgency or intent, lack specificity. Phrases like "Important Update," "Urgent: Read Now," and "General Inquiry" do not give the recipient detailed context about the content of the email, making it difficult for them to decide when to read it or how urgent it is. A good subject line should ideally specify the request or information contained in the email—like the rescheduling of a meeting—allowing for better organization and response efficiency.