The figure shows a grid formed by a collection of unit squares. The unshaded…

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The figure shows a grid formed by a collection of unit squares. The unshaded unit square in the grid represents a hole.

A four-by-four grid of unit squares with black dots at all intersections. All cells are grey except the white hole at row 2, column 2, counting from the top left. Horizontal and vertical dimension arrows beside the bottom-right cell each read 1 unit.

What is the maximum number of squares without a “hole in the interior” that can be formed within the 4 × 4 grid using the unit squares as building blocks?

  1. A.

    15

  2. B.

    20

  3. C.

    21

  4. D.

    26

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