What? The introduction needs to clearly explain what the commentary is about. This section needs to explain in your own words what is required as stated in the assignment brief given above.
How? The second part of the introduction need to outline how the commentary is structured/ presented. You need to summarise the details given in points 2 and 3 below.
Why? An introduction needs to articulate why the topic under consideration is of significance. Here you are giving a rationale for the topic. Use references to support it.