Text stimulus (table): Table titled 'Promotion Rate by Age and Company Tenure.' Columns: 'Age group,' '0-4 years tenure,' '5-9 years tenure,' and '10+ years tenure.' Rows: 25-39 | 12% | 24% | 35%; 40-54 | 11% | 25% | 34%; 55-64 | 12% | 23% | 36%. Note: 'Age groups have different proportions in each tenure band.' What is the most careful conclusion?