The complete adjective clause is B. to whom I dedicated my essay about Spain.
An adjective clause is recognized as such when it completes these three requirements.
1) contains a subject and a verb
2) starts with a relative pronoun (who, whom, whose, that, or which) or relative adverb (when, where, or why)
3) it functions as an adjective. Answering one of the questions which one? what kind? how many?
1) subject - I ; verb - dedicated
2) relative pronoun : to whom
3) which one? this person
It can be considered a memoir, Elizabeth P. Donner Houghton's rememberings of her childhood experiences on the Donner wagon train headed out west to California, in retrospect from the standpoint of an adult writing about them from memory.
This sentence is an example of an idiom
The answer would be b, rising action.
