Marketing Cereals

Hello, this is a Global marketing review on the documentary on BBC’s The Foods That Make Billions: BREAKFAST CEREALS. https://www.youtube.com/watch?v=iuXbBIyE-iY

Please answer the following questions:
1- How did companies selling cereal breakfast manage to create a multibillion-dollar market? Think in terms of a) marketing mix (4Ps) and b) positioning.
2- How did they address bad publicity (via positioning)?

Attached are some notes on the first part of the documentary.https://www.purelybranded.com/insights/the-four-ps-of-marketing/