The instruction is for us to fill the blanks with words that correctly describe the nouns in the sentences. The words that correctly fill the blanks are;
So, the sentence will take the form below.
In the sentence provided, it is necessary that we choose words that fill the concept of the subject being discussed in the sentence.
Moral values get declined when they become what they were not formerly known to be.
In the last contrast, something might not just be likely, but also possible.
Therefore, option A fits best.
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