Answer: The correct options are A and C.
The author is expressing a subjective perspective when it says :
“a very good port”
“very good” is not an objective point of view, it is not accurate in terms of precise information because the author is giving importance to its own feelings and believes, and not attending to real facts. The author is expressing his opinion about a port, which can be different from other person belief’s. It is just an interpretation of reality made by his own thoughts and emotions.
The same happens with option C:
“a fine city of great size and splendour”
In this case, the author is characterizing the city as “fine” which could also be “horrible” to another person, because it is based on the author feelings and belief’s. Moreover, “great size” it is not an exact measure, and readers do not know what the author considers great or small or to what is he comparing it too. In conclusion, both sentences give just and opinion and not real data.