After Diane finished the test, she sat back and relaxed.
This sentence is an an example of C. polysyndeton.
Answer:
Well, your question is very open-ended in the absence of any context.
Some possible correct responses would be:
* It is a complex sentence (a dependent clause + an independent clause)
* It is a conditional sentence (if this, then that)
* It is a complete sentence (S-V agreement, tense, grammar, punctuation)
Explanation: