Mortality
Georgiana's birthmark symbolizes MORTALITY. According to the narrator, every living thing is flawed in some way, nature's way of reminding us that every living thing eventually dies. The hand-shaped mark on Georgiana's cheek is the one blemish on an otherwise perfect being, a blemish that marks her as mortal.
I don't think that your options match your tiles - you must have copied them wrong. I can only match iambic pentameter with D. each foot consists of one unstressed followed by a stressed syllable.
However, enjambment has nothing to do with the stress in syllables, but rather with the fact that some poets like to continue a sentence in a poem into the next line, without the use of commas or other pauses. Blank verse is a type of a verse that doesn't have a rhyme, and is made up of iambic pentameters.
<span>B. The history of the present King of Great Britain is a history of repeated injuries and usurpations, all having in direct object the establishment of an absolute Tyranny over these States.</span>