The correct answer is C. Wriggle.
To wriggle is to move along with quick, short twistings. It is often used to describe the movement of snakes or worms, but it can also be used to describe the movement of people or other animals. For example, a person might wriggle their way through a crowd, or a fish might wriggle its way through the water.
The other options are not as accurate descriptions of the movement of quick, short twistings. Swagger is to walk with a proud or self-confident gait. Stumble is to walk or move in an unsteady or clumsy way. Crawl is to move on one’s hands and knees.