Regarding causation and imagination in historical analysis, which of the following statements are CORRECT?

(a) Establishing a single, definitive cause for historical events is rarely achievable due to the complex interplay of factors.
(b) Historians employ their imagination to reconstruct past events by filling in gaps in the historical record.
(c) Historical imagination is completely unconstrained by evidence and allows for entirely fictionalized narratives.
(d) Ideally, historical interpretations should present a single, causal narrative for a historical event.