Answer: A. Inform the readers about pecan trees.
Explanation:
They mention Thomas Jefferson to make the audience understand the importance of pecan trees.
Answer: 1.Technology was developed to meet the demands for ice cream, and there are disagreements about who invented the ice cream cone.
Explanation: These ideas are repeated in the passage as well as consistent in the passage.
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The sentence that contains a dangling modifier is C. Having fallen behind the sofa cushion, I couldn't find my car keys for almost an hour.
A dangling modifier is an ambiguous sentence in which the reader is not sure what the modifier modifies. In this case, grammatically speaking, "having fallen behind the sofa cushion" is modifying "I" when the intended meaning was, probably, that the keys had fallen behind the sofa cushion and that is why the writer could not find them for an hour.