Which of the following is an option to initiate a Google Hangout?

Initiating a Google Hangout can be easily accomplished by clicking on the name in your Gmail chat list. This option allows you to directly engage with your contacts who are online and available for conversation. Gmail integrates seamlessly with Google Hangouts, enabling users to start a video call or chat with just a few clicks. By accessing the chat feature, you can initiate communication without needing to leave the Gmail interface, making it a quick and convenient option for reaching out to others.

The other options, while they may serve to communicate or invite someone to a topic or event, do not directly initiate a Google Hangout session. Sending a postcard invitation is not a digital method and does not connect with the Hangouts platform. Sharing a calendar event primarily organizes schedules and suggests a meeting but does not instantly start a Hangout. Texting an invitation link is a way to inform someone of a Hangout, but it does not initiate the conversation or session itself—there's a reliance on the recipient to act on the link.