Since britan was already a world power he didnt want it to become more powerful than china
It would be (the) because those are the only words that reapete
D most likely because we can then learn if the animal gets affected by the amount of whatever you use or not.
It is B. abcbdd. As the words on the end of the line are:
Evening
Done
Door
Sun
Green
Wilhelmine
It starts on A and that doesn't rhyme with any others but then done and sun rhyme and so do green and wilhelmine.