Answer:
Execution of the campaign.
Step-by-step explanation:
In this context presented by the question, it is correct to state that Teresa Matthews, Coca-Cola's advertising campaign manager, is in the campaign execution stage in the process of developing the advertising campaign.
This stage can be seen by the information contained in the question, such as the fact that she is talking to distribution networks about when the ad will run and discussing the expected effects of the ad on consumers with commercial artists.
The campaign execution stage is essential for an advertising campaign to be successful, strategic planning is needed on where and when to run the campaign and what the expected effects will be, so that the campaign reaches its initial purpose and brings benefits to a company, such as attracting consumers and creating value for the target audience.