Why Is Creation of a Product the Starting Point for the Marketing

Why is creation of a product the starting point for the marketing mix?

A) The production department must know what to produce first.
B) Production strategy is the first of the four Ps listed in the marketing mix.
C) Determination of the price,promotional campaign,and distribution network cannot begin until the product has been specified.
D) Product development takes the longest amount of time to complete.
E) Actually,the product does not have to be the starting point--promotional strategies are often the starting point.