Which of the following provides the most amount of curl while sitting at its base?

The option that provides the most amount of curl while sitting at its base is the on-base curl. This type of curl requires the roller or curling tool to be positioned directly on the base of the hair strand, allowing for maximum lift and volume. By placing the roller on the base, the hair is wrapped completely around it, which creates a tighter curl. This positioning results in the curl starting right at the scalp, providing not only a more defined curl but also enhancing the overall fullness of the hairstyle.

In contrast, other types of curls, such as the half stem curl or no stem curl, do not provide as much curl at the base. The half stem curl is positioned halfway up the base, resulting in a more moderate amount of curl and lift. Similarly, the no stem curl is placed at the very end of the hair strand, creating waves rather than tight curls. Off-base curls, on the other hand, are placed below the base area, which results in minimal lift and more relaxed curls. Thus, the on-base curl is the most effective technique for achieving maximum curl tightness and volume right from the roots.