- A(a)
- B(b)
- C(c)
- D(d)
Step-by-Step Solution
A cell is orange in the third grid only when it is orange in BOTH of the first two grids (top row: the top-middle cell and the centre are the only cells shaded in both). In the bottom row the cells shaded in both grids are the top-left, middle-right and bottom-right cells: (a). (b) keeps every cell shaded in either grid, (c) keeps the cells shaded in only one grid and (d) misses the bottom-right cell.
Answer: A) (a)