A.
not a, since these civilizations were known for beautiful architecture
B.
true
C.
true, but these are not the only possible forms
D.
true (i think)
....so b and c.... and POSSIBLY d
As many times as you want makes most sense to me but they all fit in the sentence
Here ya' go? A really bad doodle brought to you by me. Hope this helps? (Just trace it if you need to, I really don't care)
The correct answer is: [D]: "the baby boom generation" .
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