Answer:
A - Knows who his companion is.
Explanation:
The lines are: "Faith kept me back awhile," replied the young man, with a tremor in his voice, caused by the sudden appearance of his companion, though not wholly expected."
The young man knows who his companion is given that when he saw him, it caused a tremor in his voice given that he suddenly appeared and was not expected.
Out of those lines, we can infer that he is not happy or annoyed, but that he knows who he is.
