The correct option is C the shortest
A sentence is said to be in the superlative degree of comparison when a noun is of the highest quality. In the given sentence, the noun 'She' is the 'shortest' compared to the other ladies in the room. The article 'the' is used before the superlative 'shortest' because the noun is specific, option D has the phrase 'the shortest' hence it's the correct option. Option A is incorrect because the word does not show any degree of comparison on its own. Option B is incorrect because it's a positive degree of comparison (as short as) . Option C is incorrect because it's a comparative degree of comparison (shorter than).