To create a smaller scale drawing of the original photograph (6 inches by 4 inches), the dimensions should be proportionally smaller than the original.
Among the options given, the only dimensions that represent a smaller scale drawing (i.e., both dimensions reduced) are:
- 1 inch by 0.5 inches
This option maintains the same aspect ratio as the original, making it a valid smaller scale version. The other options either maintain the same scale or are larger.
Therefore, the correct choice is:
1 inch by 0.5 inches