Final answer:
The coordinating ideas that are not expressed in similar form are in option C.
Step-by-step explanation:
The correct answer is C. She fell into the lake with grace and he scooped her out with dignity. In this sentence, the coordinating ideas are 'fell into the lake with grace' and 'scooped her out with dignity', but they are not expressed in similar form. The first idea is expressed using an adverbial phrase, while the second idea is expressed using a verb phrase. This lack of parallelism makes option C the correct answer.
Learn more about Coordinating ideas in sentences