I think the best choice is the last one: <span>d. appropriate length.
. Length is also determined by the purpose of the work and the context in which it will appear. (for examples, some newspaper articles have per-specified length). </span>
The first one is Lady Bracknell. The second one is Gwendolyn Fairfax. The third is Jack Worthing. Fourth one Is Cecily Cardrew. The last one is Algernon Moncrieff.