Correct Answer: spin

Solution : The fourth option is the correct answer.

Whirl as a verb refers to a rapid, circular motion or movement. It often implies spinning or turning swiftly around a central point.
Spin is a suitable synonym in this context, as it also conveys the idea of rotational movement or turning rapidly in a circular manner.

The meanings of the other options are:

Fold means to bend or bring together parts of something, typically a flexible material so that it lies flat or becomes smaller in size. For example, fold a piece of paper.

Wrap means to cover or enclose something by winding or folding a material around it. For instance, wrap a gift with paper.

Build means to construct or create something by putting parts or materials together. This term is often associated with the process of assembling structures or objects.

Therefore, the correct synonym is spin.