Figurative language: uses different figures of speech such as hyperbole, simile, onomatopoeia, metaphor among others.
In this sentence: The writer uses a metaphor and imagery . The horse represents courage, vitality, control. The color white, purity, trust. Flood, fill out beyond limits
Imagery: Flood, youth, dreams, poetry, white
B. A possessive noun should have its instead of it's (which is a contraction for it is).
For A. Diana is a singular noun and the apostrophe should come after the r instead of after the s.
For C. The duck would've dunked ITS instead of IT'S beak since it is possessive.
For D. You do not need to put an apostrophe since theirs is already a possessive noun.
Yes it is true that Latin is more exact and precise than Greek. This is mainly because of the way they say, use the language, for example, the letting and alphabet.