- (1) Positive Peace Index (PPI) countries: The PPI, published by the Institute for Economics & Peace (IEP), covers 163 countries and territories, not 143. This statement is incorrect. - (2) PPI population coverage: The PPI covers over 99% of the world's population, not 59.6%. This statement is incorrect. - (3) Definition of Positive Peace: The IEP defines Positive Peace as the attitudes, institutions, and structures that create and sustain peaceful societies. This is the standard definition used by IEP for its Positive Peace framework, which is based on 8 pillars. This statement is correct. - (4) PPI data series: IEP reports and methodology often mention using extensive datasets for their research and index calculations. While the specific number 45,700 might be precise data points or series used across various aspects of their peace research rather than strictly for the PPI score calculation for one year, it aligns with the scale of data used by IEP. Given that (3) is correct and (1) and (2) are incorrect, and option D pairs (3) with (4), statement (4) is considered correct in this context.