Answer:
The most notable difference that I remember between Rowan and Citra is that Rowan seemed more absolutely determined, while Citra seemed to carry some determination, albeit with compassion more prominent. This brings into question the idea of worthiness for being a Scythe - since a Scythe is able to kill people at a whim with no repercussions, perhaps even with praise, should one value compassion or absolute unbiased determination? Objectively, Rowan is better fit - he is more determined and able to take lives due to his nature. This will be seen later on in the book if you read what happens to him in the future. However, as compassion is needed when interacting with others, especially given a difficult idea such as killing, Citra may be a better fit, as she can be empathetic to those who are in the position of being gleaned.
TL;DR: It depends on your point of view. Both are good candidates, as Faraday asserts simply by choosing them to be his apprentices.
B.) That he had fathered a son instead of a daughter
"the difference is that the poet is the person who writes the poem, and the speaker is the person who tells the story."
D) in the book; adjective
The phrase "In the book" in the sentence conveys extra information to modify the sentence. Without the adjective the sentence would be
The children found the (in the book) pictures very interesting.
If you think I may be wrong, try removing the choices for your self.
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