The correct answer is: D. no article, a
Wisdom is a great virtue. It is the ability to use knowledge and experience to make good decisions and judgments. It is also the ability to understand and appreciate the deeper meaning of things.
The article “a” is used before singular nouns that refer to a general class of things. For example, “I like to read books.” In this sentence, “books” refers to any book.
The article “the” is used before singular nouns that refer to a specific thing or person. For example, “I like to read the book that you gave me.” In this sentence, “the book” refers to a specific book that the speaker has been given.
In the sentence “Wisdom is a great virtue,” the noun “wisdom” is not preceded by an article. This is because wisdom is not a specific thing or person, but rather a general quality or characteristic.
The article “an” is used before singular nouns that begin with a vowel sound. For example, “I saw an elephant.” In this sentence, “elephant” begins with a vowel sound, so the article “an” is used.
However, the word “wisdom” does not begin with a vowel sound. Therefore, the article “an” is not used in the sentence “Wisdom is a great virtue.”