An example can be hot dogs and hot dog buns. If the price of one of them falls, it would lead to the product being cheaper which would increase sales, thus bringing the demand for the other one to be much higher.
The sentence fragment present in those sentences is...
Regina and her younger sisters.
Answer:
childish, obnoxious, blaring
I'd choose "revise the structure of your essay by making the progression more logical."
Out of all the given answers that one makes most sense
