The correct answer is of option C.
To determine the correct option where the grids are shaded red and blue in the ratio 1:2, we need to find the ratios for each given choice.
Let's evaluate each option:
A.
does not simplify to
.
B.
does not simplify to
.
C.
simplifies to
, so this is a potential correct option.
D.
does not simplify to
.
E.
does not simplify to
.
F.
does not simplify to
.
Therefore, option C
is the correct choice. This option indicates that out of 12 grids, 4 are shaded red, and 8 are shaded blue, which simplifies to the required ratio of 1:2.