::
Many questions have answers where the two distractors are each one step in the wrong direction, which may hint at the one in the middle (that shares one characteristic with each of the other two) being right. Obviously it doesn’t always work, but if you’re guessing, you’re stuck anyway, right?
Example:
a) buy x and sell y
b) buy x and buy y
c) sell x and buy y
Two answers have buy x, and two answers have buy y, so guess b. This can also help if you know one but not the other, so you can eliminate one choice (i.e., I know I need to buy x, but have no clue about y).