单选题 During the Renaissance, graphs and diagrams ______.

A、 were often used to aid scientific researches
B、 served as sources of fresh ideas for some scientists
C、 could provide scientists with an immense quantity of knowledge
D、 were necessary for the expression of creative ideas

【正确答案】 D

【答案解析】由第二段得出结论，因为文艺复兴时期的天才应用图表表达他们的创新思维。