The correct option is They cannot write about the inner affairs of the household.
Explanation
The question pertains to the specific conventions of confidentiality and secrecy that govern the employees of the British Royal Household. These restrictions are designed to protect the privacy and dignity of the Sovereign and are distinct from general civil service rules.
Analysis:
- They cannot write about the inner affairs of the household is Correct: Employees of the Royal Household are strictly restricted from writing about, publishing, or disclosing details regarding the inner affairs or private lives of the Royal Family. This is often enforced through strict confidentiality agreements and employment contracts to ensure the privacy of the institution.
- They cannot travel abroad without permission is Incorrect: There is no general restriction preventing employees from traveling abroad, provided it complies with their leave and duty schedules.
- They cannot vote in national elections is Incorrect: Employees of the Royal Household retain their civic rights, including the right to vote in national elections. The convention of not voting applies specifically to the Monarch to maintain political neutrality, not to the staff.
- They cannot marry outside their social class is Incorrect: Restrictions on marriage based on social class are archaic and do not apply to modern employees of the Royal Household.
Key Takeaway: Staff of the British Royal Household are bound by rigorous confidentiality protocols that prohibit them from publicizing the internal affairs or private matters of the Royal Family.