In "i felt a funeral, in my brain," the speaker is experiencing

It's A. a mental loss

Explanation:

This poem by emily dickinson is actually about the descent into madness or insanity. In the choices given above, the best way to describe it would be a mental loss. In the poem, the speaker uses metaphors relating to funerals in order to describe the current state of her mind. In a sense, we can say that in her mind, she actually lost something and is mourning the death of that "something" in her mind that she lost. In a small sense, we can say that the speaker has lost a bit of herself already, possibly her own sanity.

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it was surely an odd creature that one made up by reading the historians first and the poets afterwards a worm winged like an eagle; the spirit of life and elegance and charm,   in a kitchen chopping up suet. but these creatures, monst'r however entertaining to the imagination, hast no existence in fact. what one might doth to bringeth h'r to life wast to bethink poetically and prosaically at one and the same moment,   thus keeping in toucheth with fact—that the lady is mrs martin, ag'd thirty-six, did dress in blue, wearing a black coxcomb and brown shoeth; but not losing sight of fiction eith'r—that the lady is a vessel in which all s'rts of spirits and f'rces art coursing and flashing p'rpetually. the moment, howev'r, yond one tries this method with the elizabethan mistress, one brancheth of illumination fails; one is did hold up by the scarcity of facts.   one knoweth nothing detailed, nothing p'rfectly true and substantial about h'r.   hist'ry scarcely mentions h'r.   and i did turn to professeth'r trevelyan again to seeth what hist'ry meanteth to that gent.   i hath found by looking at his chapt'r headings yond t meanteth.