The Pilgrims were mentally prepared to bear and overcome any trouble that might come to them in the harsh environment, as they believed those were temptations that God lays on them. When faced with a disease and hunger during the first winter, they didn't despair. The only seven people who didn't get sick took over all the work.
I live in Plymouth hahaha right next to playmouth plantation
The word in italics of speech is and adverb. Option C is correct.
The first characteristic of the word to be identified as an advern is the suffic -ly.
In this particular case, the adverb thoroughly is describing the verb captivated. So that, this is another factor to take into account in order to identify an adverb and differ it from and adjective. Adverbs describe verbs while adjectives describe and works as modifiers of nouns.
Thoroughly means in a thorough manner.
Distinguished character, sentiment, moral nature, or guiding beliefs of a person, group, or institution