For a list to be binary search-able, we need the following thing to be true, because... a. The list must be sorted, because checking the half way point in binary search assumes that the elements to the early part of the list are less than each midpoint and the elements later in the list are greater. b. A list without any negative numbers. Binary search cannot find negative numbers. c. An unsorted list, because binary search will sort the list while it does the searching operation. d. A randomized list, since binary search will have the best chance of finding an element.