Which of the following allows you to send a quick drawing in iMessage?

Digital Touch is the feature that enables users to send quick drawings in iMessage. Through this tool, users can create sketches, tap out messages, send heartbeats, and utilize other expressive forms of communication by simply drawing on the screen. This makes it a unique and engaging way to interact in a chat, as it allows for personal and artistic expression instantaneously.

While Memoji focuses on creating personalized animated avatars for conversations, it doesn’t facilitate the act of drawing. The iMessage Sticker Pack refers to collections of stickers that can be sent but does not include the function of drawing. Quick Reply generally pertains to responding to messages quickly without needing to open the conversation fully, but it does not relate to sending drawings. Thus, Digital Touch stands out as the correct feature for sending quick drawings in iMessage.