In order to make sure two objects are perfectly vertically aligned, a user should drag of the objects next to the other until a guide appears

In order to make sure two objects are perfectly vertically aligned, a user should drag of the objects next to the other until a Smart Guide appears. These temporary snap‑to guides help the user to align, edit, and transform objects or artboards relative to other objects. When you transform an object, Smart Guides automatically appear to assist the transformation.

answer; the correct answer is technician b;