Answer: Marketing managers
Step-by-step explanation:
According to the given question, the marketing manager plays an important role in the product line decision as it is mainly responsible for setting the objective related to the products and the services in an organization by using the proper business strategies.
The main role or responsibility of the marketing manager is that it promoting the products, brands and the services in the market.
They also managing the product line goods and the services by using the marketing strategies. Therefore, Marketing managers is the correct answer.
Therefore, Marketing managers is the correct answer.