Answer:
D). Using repetitive sentence structure.
Step-by-step explanation:
'Ineffective writing', as the term suggests writing that fails to create an impact on the minds of the readers or proves impotent to generate the intended effect on them.
As per the question, 'the use of repetitive sentence structure' in research papers may create an unproductive effect on readers as the repetition may create monotony and compel the readers to lose interest in the paper. Therefore, it would not be able to create the desired/intended effect on the readers and turn it inefficient and futile. Writing is a creative process and therefore, ideas need to be presented in a unique and varied manner that carries a coherent meaning and appropriate grammar. The paragraphs must correlate and they should support the thesis statement. Thus, option D is the correct answer.