Unsigned register statement of conditions deemed:

In legal and administrative contexts, standard conditions often apply to similar situations even if a specific document is not signed, based on established practice or legal presumption.

• In force for similar tenancies (B) is the correct answer. This implies that if a standard set of conditions is consistently applied to comparable tenancies, it can be deemed applicable even if a specific statement is unsigned, reflecting common legal practice.
• "Collector’s choice" (A) suggests arbitrary decision-making, which is inconsistent with legal frameworks.
• "Null" (C) would mean the statement has no legal effect, which contradicts the idea of standard conditions being applicable.
• "Latest Govt issue" (D) might be the source of the conditions, but it doesn't explain why an *unsigned* statement would be deemed in force without reference to its application in similar contexts.