Read the following context and answer the question.
Context: But first I had to trim away some of the shrubs growing up around the window frames . I trimmed other brush , too , because I was out in the yard working , anyway . Foul white flies and other winged pests flew up around me as I worked . I found a nest yellow - jackets in a hole by the apple tree , and killed them .
Question: How may they have killed the yellow jackets ?
Answer:


None of the above choices .