Middle answer. They're alphabets turned sideways.
--Brandon
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I posted in a rush, but had an afterthought that I probably should have included a spoiler alert and masked the solution in white text, which could have then been revealed by highlight.
Unfortunately, I can't be totally sure of that answer without consulting the answer key or receiving the answer from an otherwise reliable source or by other reliable means (e.g., reverse engineering a scoring system).
It is unlikely, though, that not only would four for four of the objects in the sequence resemble alphabetic letters -- but also that they would each appear in correct (alphabetic) order, each as its respective letter rotated counterclockwise 90° (or clockwise 270°), and all belong to a continuous section of the alphabet such that the (problem) letters can be drawn with only straight lines and intersections (to make them less identifiable and confuse the test taker).
Also, the problem difficulty seems right. Too many coincidences to likely be pure chance, and too obscured to be a simple lure.
As a general rule for inductive test problems permitting only one solution, I think Occam's razor applies when there are multiple patterns which yield the same answers in the sample portions of the problem sequences but different possible answers in the answer choices; but only when there is absolutely no conceivable way to weed out the extra possibilities.
It is induction, so it might still be wrong, technically. :)
--Brandon