Answer:
b. Allowed if the rest of the shoe was of a contrasting color
Step-by-step explanation:
We have to go through the options
Like in first option it says that it could not allowed plus it cant be trademarked as the color should be trademarked plus it is a brand and it also protected
The third option is incorrect as it is not relevant for the red sole case
Therefore option b is correct as it shows the contrasting color