A.I. Explanation:

Option 1: "Creating complicated models."

Explanation: This option is incorrect because the text explicitly states that data science is not about making complicated models. The speaker emphasizes that the focus should be on using data rather than on the complexity of the models.

Option 2: "Developing impressive visualisations."

Explanation: This option is also incorrect as the speaker mentions that data science is not about making awesome visualisations. The main point is that visualisations are not the goal of data science, but rather a tool that may be used.

Option 3: "Writing effective code."

Explanation: This option is incorrect because the speaker clearly states that writing code is not the primary focus of data science. The emphasis is on solving problems with data, not on the coding aspect.

Option 4: "Using data to solve real company problems."

Explanation: This option is correct as it aligns perfectly with the main idea presented in the text. The speaker highlights that the essence of data science is to use data to create impact by solving real company problems, which is the core goal of a data scientist.