The Correct answer is B. He admits that he has a strong emotion about Baltimore when he says “I shall never forget the ecstasy with which I received….” But he remains formal when he explains the relationship between the others characters and introduces Anthony as his "old master".
Through all his memories Frederick Douglas avoids too much sentimentalism, even when he tells the reader about his time as a slave and the hunger and cold he suffered. He prefers to use other rethoric devices such as pathos, logos and, ethos.
Letter C is incorrect because at this moment pathos is not utilized - pathos is the using of his imaginary and figurative language to provide the emotional response from the reader.
Letter A is incorrect, he mentions Anthony as his old master because of his formal way of addressing his acquaintances.
Letter D is incorrect because he shows his strong emotions yet in a formal way.