This question is about writing techniques. The correct answer is 'C. Transitions' because they are used to connect ideas between sentences and paragraphs, making the writing flow smoothly. 'A. Repetition' can be effective but can also lead to redundancy, 'B. Restatement' is useful for clarity but is not a development technique, and 'D. RHETORICAL QUESTIONS' are used for effect but do not develop paragraphs.