Study the figures in Set A and Set B carefully. Identify the pattern or rule…

In this figure-classification question, the two categories are defined by how the two black dots relate to the surrounding line: Set A figures use an OPEN (unclosed) line or bracket, with the two dots left outside any enclosed area; Set B figures always contain at least one CLOSED region (a triangle, square, pentagon, or similar loop), with both dots placed together inside — or partly inside — that same enclosed area.

The target figure is a closed triangle with both dots placed together inside it. Since both dots share the same enclosed boundary — exactly the defining feature of Set B — the target figure belongs to Set B.

• Set A: ruled out — Set A figures are open/unclosed, so the two dots never share one enclosed region; the target's dots sit inside a fully closed triangle, which does not fit this rule.

• Both Set A and Set B: ruled out — the two categories' rules are mutually exclusive (open vs. closed boundary), so no single figure can satisfy both at once.

• Neither Set A nor Set B: ruled out — the target clearly satisfies one of the two categories' defining rule (a closed region enclosing both dots), so it cannot be excluded from both.

Therefore, the target figure belongs to Set B.