First category of successors is:

Succession laws, particularly in agricultural tenancy or specific property rights, often prioritize certain categories of heirs to ensure continuity. Historically, and in many traditional legal frameworks, male lineal descendants are given primary importance. Option C: 'Male lineal descendants' is accurate because in many tenancy laws, especially those with historical roots, male lineal descendants (e.g., sons, grandsons) are often designated as the first category of successors to ensure the continuity of cultivation or family lineage.

• Option A: 'Widow' is typically a successor but often after lineal descendants or in conjunction with them, not usually the first category by default.
• Option B: 'Daughters' are also successors but might be ranked differently than male lineal descendants in some specific laws.
• Option D: 'Nominated successor' is a specific mechanism, but there is usually a default order of succession before nomination comes into play.