According to the passage, windmills aided the growth of the country of Holland J. by pumping seawater, the Dutch flooded coastal bogs in order to improve ship travel.
Dull category
Terman claimed that different IQ scores correspond to different categories of intelligence, as shown below:
Under 70 - Feeble-mindedness
70 - 79 - Borderline deficiency
80 - 89 - Dullness
90 - 109 - Normal or average intelligence
110 - 119 - Superior intelligence
120 - 140 - Very superior intelligence
Over 140 - Genius or near genius
Thus, a score of 84 represents an individual in the dull category.
Terman calculated IQ by dividing a person's mental age by their chronological age.
The narrator is looking for Rev. Leonidas Smiley as his friend told him to.
I would say that the fragment is either C or D. I'm leaning more towards D though.