In the diagram, how many $1 \times 1$ squares are shaded in the $6 \times 6$ grid?
(A) 29
(B) 30
(C) 31
(D) 32
(E) 33

![](https://cdn.mathpix.com/cropped/2024_04_20_6ed09463f225f8ba1f07g-038.jpg?height=262&width=263&top_left_y=693&top_left_x=1294)
In each of the 6 rows, there is 1 unshaded square, and so there are $6-1=5$ shaded squares per row.

Since there are 6 rows, then there are $6 \times 5=30$ shaded squares.

Alternatively, we note that there are $6 \times 6=36$ squares in the grid and 6 unshaded squares, which means there are $36-6=30$ shaded squares in the grid.

ANSWER: (B)