Concept:A design folio is used to collect and arrange design work in a clear, organised way.
Explanation:A folio contains sketches, notes, and design ideas.
It helps the designer arrange each stage in a logical order.
This makes it easy for the designer, client, or examiner to follow and understand the design process.
Thus, its main purpose is to organise and present ideas clearly.
Answer:C. organise and present ideas clearly.