D, to persuade readers to adopt an author's suggested course of action.
<span>After going over the recipe, I believed the cake would be easy to make.</span>
As the 20th century progressed, the laws of science were increasingly considered to be mysterious and questionable. Option D is correct.
Science advanced dramatically during the 20th century. New and radical developments in the physical, life and human sciences existed. Besides, a great amount of new technologies were developed in the 20th century. Moreover, some technology innovation created in the nineteenth century were perfected in the 20th century.
