Which version best uses variety of sentence structures to enhance the flow and writing style of a story?

after the moon goes from a full moon it turns into a waning gibbous moon.

here's where my answer came from. i hope this .

answer: librarians is the correct word.

answer: dinner and a movie with your friends this saturday night.

opportunity cost refers to the benefits that a person or business misses out on when choosing one alternative over another. opportunity costs are easy to miss, but they can be important for decision-making. in this example, the alternative that the person will miss out on is the opportunity to have dinner and watch a movie with friends on saturday, as he will have no money left after buying the cd.