Shown on the left are three tiles. Which option(s) can be made using only these tiles? Rotations of tiles are allowed. 
A
B
C
D
The base tile shown on the left is a single column split into three parts: a plain square top, a curved leaf-like middle section, and a quarter-circle tapering to a point at the bottom. Since rotations of this tile are allowed, four copies of it, turned to different angles, are combined to build each 2x2 answer pattern. The tile only fits cleanly against a rotated copy of itself when a curved edge meets another curved edge of matching direction, or a straight edge meets another straight edge; a curve meeting a straight edge, or two curves bulging the same way instead of nesting into each other, leaves a mismatch.
Only option B keeps every curved and straight edge matched cleanly across all four rotated copies of the tile, with no leftover gaps or mismatched edges anywhere in the 2x2 arrangement.
So the option that can be made using only the given tile is Option B.








