A show of understanding or non-understanding through facial expressions
Both poems deal with the theme of ideas in the air that are related to the conflicts between belief systems related to romanticism. More or less it is the idea of common sense between spiritual and while Ode to a nightingale focuses on this, A slant of light speaks of oppression that's in the air and a fleeting sense of spiritual.
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A topic is like a title of a book and a Unit is like the chapters in the book.
The answer is C decided.
Determined synonyms:
Resolute, full of determination, purposeful, purposive, resolved, decided, adamant, single-minded, firm, unswerving, unswervable, unwavering, undaunted, fixed, set.