Select the figure from among the given options that can replace the question mark (?) and logically complete the series.

Correct — B. Two rules run at once.

Rule 1: the mark standing outside the shape moves inside it in the next frame, and a fresh mark appears outside. Outside runs A, star, B, infinity, then C. Inside runs hash, A, star, B, then infinity.

Rule 2: the whole figure turns 45° clockwise each frame. Read the turn off the stalk, the short line with a crossbar sticking out of one edge. It points down, then down-left, then left, then up-left, so in frame 5 it points straight up.

Four steps of 45° make a half-turn, so the house that pointed up in frame 1 now points down. Option (b) shows that point-down shape with the stalk on top, infinity inside and C outside.

Why the others are wrong

• (a)
  Option (a) has the shape and the turn right but the two marks swapped, with C inside and the infinity sign outside. The rule moves the previous frame's outside mark in, and frame 4 carried infinity outside.
• (c)
  Option (c) carries the right marks, but its point faces left with the stalk out to the right. That is a 270° turn from frame 1, a quarter-turn past the half-turn that four 45° steps reach.
• (d)
  Option (d) also carries the right marks, but its stalk points up and to the right — one 45° step too far. In frame 5 the stalk stands straight up.

When a figure series changes two things at once, split them and solve each on its own. Here one rule moves symbols between the inside and the outside, the other turns the frame.

For the turn, find a feature with no symmetry and track it. The stalk is that feature: it protrudes from one edge, so its direction gives the exact rotation.

The five-sided outline cannot, because more than one turn leaves a similar-looking outline.

For the symbols, read the two slots as a queue. Whatever stands outside a frame is inside the next one, so the mark outside frame 4 tells you what must be inside frame 5.

Key facts

• The mark outside a frame becomes the mark inside the next frame.
• The stalk's direction fixes the rotation, while the outline alone does not.
• Four steps of 45° clockwise add up to a half-turn, so frame 5 is frame 1 turned over.

Common traps

• Judging the rotation from the five-sided outline, which repeats itself as it turns
• Putting the new letter inside the shape and the old mark outside
• Stopping at a 135° turn because frame 4 already looks close to upside down

No directly related past PYQ was found.