Why must sayadio use a gourd to catch his sister's spirit?

Which of these can an adverbial clause modify?

What is a generalization? a. a series of events that make up what happens in a story b. hints or clues that tell you what is going to happen in a story c. the final resolution or event that ties up loose ends in a story d. a simple statement about something complicated

What is one example of a word/phrase choice that may affect how people think about a particular social problem?