The correct answer is D. no article.
The word “dress” is a common noun, which means it refers to a general class of things. In this case, the dress is not being identified as a specific dress, but rather as a general type of clothing. Therefore, no article is needed.
The other options are incorrect because they all use articles. The article “a” is used before singular common nouns that refer to a general class of things, but that are not specific. For example, “I saw a dog.” The article “an” is used before singular common nouns that begin with a vowel sound, but that are not specific. For example, “I saw an apple.” The article “the” is used before singular common nouns that are specific. For example, “I saw the dog that bit me.”
In this case, the dress is not being identified as a specific dress, but rather as a general type of clothing. Therefore, no article is needed.