Explanation:
Trade routes to market were cut off by war, either water ways or roads. Farmers could not plant surpluses because they might not be able to sell the excess and it would just rot on their fields. Herds of cattle and horses were depleted either by the plundering of the British or as provisions for the Continental Army.
<span>Assuming that this is referring to the same list of options that was posted before with this question, <span>the correct response would be the book that was written by a veteran of the war itself, since this would be considered a "primary source". </span></span>