If you are thrown this kind of one liner question, I think first you need to ask a bunch of clarifying questions to understand more of the context and the objectives. Don't just jump in to structure without knowing more of the problem to be solved.
- Which firm, which region/country
- What are the markets and industries applicable in the region/country, what does the firm already have
- What is the objective of firm by 2021, key priorities e.g. market share vs profitability
Afterwards you can start structuring.