Answer:
The answer is indeed letter A. a thesis statement.
Step-by-step explanation:
A thesis statement is usually comprised of one or two sentences at the end of the first paragraph of a paper. Its purpose is to inform the reader of the idea/opinion that will be developed/defended by the paper's author, that is, the author's stand concerning that subject. It also functions as guide so that the author won't lose focus. In the passage we are studying here, the thesis statement revolves around the difficulties people who are waiting for an organ donation face. As the author says, "This story had a happy ending but so many do not." From the next paragraph on, the author will most likely present data and facts concerning the number of people who have to wait for several years or who never get to receive the organ they need so badly.