The correct answer would be letter b. False, because a short story does not necessarily need only a single problem, single plot, and single conclusion. For many short stories has have those kind of characteristics but one thing in common is that it does not contain only one thought.
Were you discouraged by the obstacle you faced?
I did a quick internet search and found that the answer could also be counter-argument however the answer could also be rebutle.
Sometimes, reading things out loud can help a lot. "I had eat all the leftovers." Does that sound right? How about "I had eating all the leftovers," or "I had ate all the leftovers"? What about "I had eaten all the leftovers"?
If this doesn't work for you, think of it like this: you must always use the PAST PARTICIPLE after a form of the word "have." For example, "I had given you the present." Which of your options is most similar? Most likely, the answer is "eaten": "I confessed that I had eaten all the leftovers."
Answer: B. Eaten