using the paths tool to draw a curved path
alternating between selection of different layers
clicking to create points with straight lines connecting them
clicking and dragging to trace a shape
I'd say C) clicking to create points with straight lines connecting them.
The alternate free select method creates a selection point.
It does this by drawing straight lines between points that you are able to
click rather than drawing it free hand with the pointer while holding and
dragging the left mouse button.
