Rationale: This constitutes unfair selection for redundancy (on the basis of recent age discrimination legislation): redundancy is potentially fair grounds for dismissal as long as the basis of selection is fair. Options B and D are potentially fair grounds: there should be a reasonable attempt at performance or disciplinary management (warnings, training etc). You may have hesitated over C, but this is an example of 'substantial reasons' that would be considered by a tribunal.Ways in: You could narrow the options by considering that there must be some way for companies to dismiss incompetent or deliberately obstructive employees.