Necessity is . . . . . . . . mother of . . . . . . . . invention. A. no article, the B. the, an C. the, no article D. a, an

The correct answer is: A. no article, the

The phrase “necessity is the mother of invention” means that people are more likely to come up with new ideas when they need to solve a problem. In this case, the article “the” is not needed because the phrase is not referring to a specific mother or invention.

Option B is incorrect because the article “the” is needed when referring to a specific mother. Option C is incorrect because the article “the” is not needed when referring to a general concept of invention. Option D is incorrect because the article “a” is needed when referring to a specific invention.