The answer is A. Newsletter
Newsletters are an effective medium for providing readers with regular updates, tips, and reminders about a particular topic. They are typically distributed periodically, such as weekly or monthly, and can include a variety of content, including short tips and reminders.
Articles are generally longer and more in-depth pieces of writing that focus on a specific topic. While they can provide valuable information, they are not typically used for delivering short, periodic tips and reminders.
Text messages are suitable for sending brief and immediate information but are not ideal for delivering content to a broad audience on a regular basis. They are more personal and direct, often used for urgent or time-sensitive communication.
Websites can host a wide range of content, including tips and reminders, but they are not inherently designed for periodic distribution. Readers would need to visit the website regularly to receive updates, unlike a newsletter that is delivered directly to them.