What action does lassoing involve?

Lassoing is a technique commonly used in editing software that allows users to select multiple clips or elements by clicking and dragging a selection area around them. This method provides a more flexible way to select items, especially when they are not arranged in a neat, symmetrical layout. By clicking and dragging, the user can create a freeform selection box that captures all elements within that area, making it efficient for quick selections of various clips in a workspace.

The other actions, while they involve selecting clips, do not match the definition of lassoing. For instance, double-clicking to select all clips suggests a single operation to select everything rather than a free-form selection. Pressing the Control key is typically used for isolating a single clip or making additional selections rather than creating a lasso selection. The use of the Pen tool generally relates to drawing or creating paths rather than selecting clips directly. Therefore, the action described in the correct answer accurately reflects the essence of lassoing in software applications.