Answer:
revealing character traits through speech, thoughts, and actions
Explanation:
Indirect characterization is when the author does not tell you about the traits of a character directly, instead implying characteristics through what they do and think.
The term that describes a carved or inscribed upright stone, usually used as a marker or to commemorate an event is a stele.
A is wrong you wouldn't say "is" you would say are.
B is wrong to because "was" is not the correct verb to use.
D is wrong because key, should be plural, keys
C is correct, because it has subject and verb agreement.