Answer:
The third sentence.
Step-by-step explanation:
The third sentence contains the central idea of the passage/paragraph.
- A number of DM (Developed Market) economies have recently outpaced their post-crisis average, although growth is likely still below potential in a number of EM (Emerging Market) economies.
The first sentence somewhat defines "strength in global economic growth". The second sentence gives statistics, particularly on the quality of growth in advanced economies (DM economies).
The third sentence summarizes both points and clarifies that potential for growth is still existent in emerging economies.