A split end occurs when the extension lash and the natural lash don't quite meet up both from____.

A split end occurs when the extension lash and the natural lash do not align properly, particularly from the base to the tapered end. This misalignment can create a gap that leads to the characteristic split or separation, which can result in an unnatural appearance.

When extensions are applied, they should seamlessly attach to the natural lash, with the adhesive covering as much of the natural lash as possible. If the extension does not reach from the full base to the tapered end, it can leave the natural lash vulnerable to environmental factors or damage, leading to issues like shedding or splitting.

In contrast, the other possible answers do not adequately address the critical area of alignment necessary for a proper lash extension application, which is particularly focused on the connection from the base of the natural lash to its tapered end. The base is where the natural lash is thick and strongest, and the tapered end signifies the delicate tip. Proper bonding in that area is crucial to the health of both the extension and the natural lash.