Answer:
D. agitation
Explanation:
This is the line from Edgar Alan Poe's "The Fall of the House of Usher". Full sentence goes like this:
"In the manner of my friend I was at once struck with an incoherence - an inconsistency; and I soon found this to arise from a series of feeble and futile struggles to overcome an habitual trepidancy - an excessive nervous agitation".
Looking at the line, we see that the synonim for trepidancy is agitation, an anxious feeliing of restlessness and excitement.
