Mirka Beauty Products, a Beauty Company, Was Testing the Quality

Mirka Beauty Products, a beauty company, was testing the quality of its newly developed cream by offering it only in the city of Brightland prior to its national launch. Unfortunately, two of its competitors released similar products before Mirka Beauty could release its product in the market. Realizing that a lapse had occurred, Mirka Beauty released its product in the market emphasizing an additional moisturizing feature which would address customers' needs during the winter season that was just around the corner. Mirka Beauty had prior information about these customer needs because of a series of tests it had conducted before releasing the product which helped it launch the product with the additional feature.
-Mirka Beauty Products marketed its product by educating consumers about the benefits of the additional feature it provided in its product.The marketing mix variable that benefited from the results of the tests is:

A) quantity.
B) promotion.
C) place.
D) price.
E) size.