Final answer:
Formal communication with the British Queen traditionally avoids contractions and none of the options given are appropriate. 'Your Majesty' is a respectful possessive determiner that can be used, even though it is not a contraction. The correct option is D.
Step-by-step explanation:
When responding to Her Majesty the British Queen, none of the contractions offered are traditionally or formally appropriate. Formal address to royalty typically avoids contractions and uses full phrases out of respect.
However, if a contraction must be used for an informal context, one might use 'Your Majesty' as a possessive determiner (though not a contraction) in a sentence, such as 'Your Majesty, your presence honors us.'
The other contractions provided ('she's', 'they're', 'we'll') are not suitable for respond directly to the queen.