Ji is doing a literature review to find information on factors that are associated with optimal running performance. Ji finds a few different studies that have conducted regression analyses, investigating different factors predicting performance. The best statistic that Ji can extract from these papers' results sections in order to compare results across the papers and find the strongest predictor of performance is: O a. P-value O b. Unstandardized beta coefficient O c. T statistic O d. Standardized beta coefficient O e. F statistic