In an article about the benefits of playing video games, what information might be included in a sidebar to best support the main idea. A chart showing rising costs of video games over the past 10 years.
A list of the most popular video games in the United States
Facts from a study showing how video games improve coordination
Images of smiling students playing video games

Facts from a study showing how video games improve coordination.

Explanation:

This answer is not only facts that will support the main idea strongly, but it is also the most positive answer to give based on what the question is asking. Showing the rising cost of video games isn't good evidence since higher costs won't make playing video games seem any better because you'd have to pay more. As for the rank of most popular video games, it wouldn't help much at all and isn't related to what the question would want to be shown. And the images seem positive due them smiling, but there is no context to it and the facts are much, much better evidence and supports the main idea best, so "Facts from a study showing how video games improve coordination" should be your answer. Hope this helps!

i'm not sure i completely understand your question, but i will do my best.

i think the answer you are looking for is sequence. (see below)

a repeated melodic fragment would be best defined as repetition, while repeated chords (different or the same) could be a chord progression. however, you then mentioned the chord and melodic fragment beginning on higher or lower pitches, in that case, the answer could be best defined as a sequence. the definition of a sequence is as follows: "the restatement of a motif or longer melodic (or harmonic) passage at a higher or lower pitch in the same voice."

let me know if this !