As a writer and reader I disagree with this. Perhaps if you are writing for a scientific journal or business report, long blocks of text can seem like you have a lot of info. Generally speaking, especially in fiction and non fiction i think unbroken pages of text will best case scenario bore a reader, worst case scenraio burden and overwhelm them with a lot of info so the feel daunted about continuing.
Vex meaning making someone feel annoyed, frustrated, or worried.
Answer:
C because rather is telling you why it's not a valley (hope I made it make sense)
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