This question addresses the permissibility and conditions for a tenant to exchange their tenancy. The correct answer is 'Subject to EDO orders'.
Subject to EDO orders (D) is accurate because tenancy exchanges, especially in regulated or government-controlled tenancies, are not freely permitted. They typically require the approval and adherence to specific directives or orders from a designated authority, such as an Executive District Officer (EDO), to ensure proper administration and prevent unauthorized transfers.
Freely (A) is generally incorrect for regulated tenancies.
Only with EDO permission (B) is similar but 'Subject to EDO orders' implies a broader regulatory framework that might include specific conditions or procedures beyond mere permission.
Only with another Govt tenant (C) is too restrictive and not universally applicable.