Answer:
"Now there came a little 'flutey' bit--very pretty!--a little chain of bright drops. She was sure it would be repeated. It was; she lifted her head and smiled."
It allows the reader to see the action from the perspective of Miss Brill and to see her objectively.
It provides an opportunity for the main character to indulge in imagination.
Miss Brill views social interaction as a stage play.
Sentence fluency refers to the ease with which words and groups of words flow when read or spoken, so the best answer is "Combining sentences to use complex structure" although that's not a great definition.
"Sweating in the heat, we had lost the whole day, dreading to be buried alive in the drifting sand." & <span>"Sand in the scanty food, sand in the brackish water—water that was drunk lukewarm from a clammy, loathsome water-skin."</span>
