In the third sentence of the second paragraph of text 18A3-I, the pronouns “which” and “it” are both replacing
- A “rim” (second sentence of the second paragraph).
- B “the waterwheel” (third sentence of the second paragraph).
- C “machinery” (third sentence of the second paragraph).
- D “Flowing water” (third sentence of the second paragraph).
- E “paddles” (second sentence of the second paragraph).