Yeah, that's a tricky, very detail oriented one.
On (A) the two side arms are about same length but on (B) the left arm is obviously shorter than the right arm. Do you see that? That makes the left part of the front view is shorter than the right part. No special tricks there but you need very sharp eyes to catch that difference at the first look. To add just one more tip, try to use 3D mental imagery with tfe whenever possible.
BTW, the pointed ends and not pointed ends here don't make any difference.