Final answer:
Syntactic ambiguity, which arises from the confusing syntax of garden-path sentences, is true and relates to mixed sentence constructions that can detract from clarity in writing.
Step-by-step explanation:
The statement that syntactic ambiguity arises from garden-path sentences is TRUE. Syntactic ambiguity refers to a situation where a sentence can be interpreted in more than one way due to its syntax, which is the manner by which words are organized into sentences. Garden-path sentences lead the reader to one interpretation that seems correct until the sentence continues, and the intended meaning requires a reevaluation of the sentence's grammatical structure. Mixed sentence constructions are related in that they can result from a lack of consistency in constructing grammatical paths.
Mixed sentence constructions, as mentioned in Section 9.6 of the referenced text, can detract from the clarity of an otherwise well-analyzed document. A mixed sentence contains parts that do not fit together due to issues with grammar or meaning. Writers using a trial and error strategy in structuring such sentences might fall into the pitfall of creating syntactic ambiguity unintentionally.