Arestaurant that creates a new type of sandwich is using blank
as a method of competition.

The answer is innovation.

We use innovations to translate an idea or invention into a good that creates value. An innovation must satisfy a specific need. As businesses continue to innovate, they must think about the toughest competitor that keeps them awake and gives sleepless nights. This, coupled with the fact that the customer demand has the most powerful relationship on innovation activities supported by regression analysis.

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.