Answer:
(C) Regret
Explanation:
“Regret” is one example of an abstract word. Abstract nouns are words that represent the names of objects but objects that are objects that cannot be captured by the five senses such as the name of the situation, the name of the job, the name of the attribute, the name of the size, and so forth. For example beliefs, benefits, welfare, air, knowledge, goodness, ideas.