Choose all of the abstract nouns.
0
tears
asked
0
regret
()
o frown

(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.

. a function is a relation in which each input has only one output. in the relation , y is a function of x, because for each input x (1, 2, 3, or 0), there is only one output y. x is not a function of y, because the input y = 3 has multiple outputs: x = 1 and x = 2.