Answer:
I think it is The ratio of gluten to starch
Explanation:
The main difference between the types of flour can be said to be The ratio of gluten to starch.
Gluten is a type of protein which means that the gluten content of flour is what separates it from others.
In conclusion, option A is correct.
Find out more on gluten at https://brainly.com/question/1290478.