Answer: Barbara Bush focused much of her energy on a cause near to her heart: literacy.
Explanation: In the first two options, the colon is being misused because it is fragmenting essential elements of a same clause (direct object "much of her energy" from complement "on a cause..." / prepositional phrase "on a cause" from prepositional phrase "near to her heart" modifying it.) In the third option, the comma should not be used to introduce the one-item list "literacy."
A sentence in a paragraph that summaries what that paragraph is about
Answer: You could write about two people meeting in a roller coaster next to each other after they were stuck on it for two hours and then after they were unstuck from the ride have them start becoming friends,and going on a date, etc and then they end up getting married and having a family you just need to add your own details :)
