Identify the figure that completes the pattern of the question figure.


a
b
c
d
Step 1: Observe the grid structure.
The figure is arranged in a $4 \times 4$ block pattern (four $2 \times 2$ groups). Each block contains four different shapes: - Circle, - Square, - Triangle, - Diamond. Thus, every $2 \times 2$ block contains all four shapes without repetition.
Step 2: Shading rule.
Notice the alternation of filled and outline patterns: - In the top-left block: Circle (filled), Square (outline), etc. - In the other blocks: Shading alternates systematically so that within a $2 \times 2$ block, two shapes are filled and two are outlines.
Step 3: Identify missing block.
The missing bottom-right $2 \times 2$ block must:
Checking the answer options:
- (a) Contains Circle (outline), Triangle (filled), Square (filled), Diamond (outline) → matches both shape-completeness and shading balance.
- (b), (c), (d) either repeat shading wrongly or mismatch the placement of shapes.
Step 4: Confirm the match.
Thus, the correct block is option (a) because it completes the last $2 \times 2$ block with all four shapes in proper shading order. \[ \boxed{\text{Option (a)}} \]
Find out which of the answer figures among (a), (b), (c) and (d) can be formed from the pieces given in the question figure.

From the given answer figures, select the one in which the question figure is hidden/embedded.
