Answer:
C). Choosing a topic.
Step-by-step explanation:
'Sentence starters' as the title suggests proposes the starter or beginning that would help offer a frame to invoke ideas. The accumulation of these ideas would assist in 'choosing a topic' and offer a kickoff to the essay or paper that would drive the entire narrative.
As per the question, option C displays that 'sentence starters' work as a signal to introduce and frame the topic that could be effectively described and demonstrated in order to form an effective and comprehensive essay or work. Thus, option C is the correct answer.