Answer:
The coordinating ideas that are not expressed in similar form is:
A. Sara wrote a problem on the board, and while she was eating, she
solved the problem.
Step-by-step explanation:
A coordinating sentence has two or more ideas that are of equal value or importance. Usually, to express coordinating ideas, coordinating sentences are constructed and combined to show that each idea is independent of the other and equally important. It is not like a subordinating sentence that is used to express a combination of a main idea and a subordinating (dependent) idea.