The connotative meaning of the word heart as it is used in the sentence is " the feelings of goodwill that Douglass has" (Option B).
It shows how deeply Douglass wants to be free. (Option A). The textual evidence that backs this up is found in the following sentence: "From that moment, I understood the pathway from slavery to freedom".
It is to be noted that connotative means secondary meaning or additional meaning.
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