The founders of life is good started their business by hawking t-shirts on the street and selling them door to door in college towns. as the organization grew, the number of different lines of products it offered grew, too. collectively, these assorted product lines might be described as life is good's

product mix

Explanation:

Product mix -

It is the total number of the product line which are offered by the company to the customers .

It is also called the product assortment .  

Hence , from the information of the question , the Life of good produced variety of t shirts as the line grew , therefore it is called the product mix .

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