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
According to the statement above: "For hunting also: the woods, lakes, and rivers afford not only chase sufficient, for any that delights in that kind of toil, or pleasure; but such beasts to hunt, that besides the delicacy of their bodies for food, their skins are so rich, as may well recompence thy daily labor, with a captains pay."
This is a description about New England.
Hope this helps.
