The correct answer is A. genuine.
A genuine article is one that is real and authentic. It is not a copy or imitation. A genuine article is made with high quality materials and craftsmanship. It is also backed by a warranty or guarantee.
A spurious article is a fake or counterfeit. It is not made with the same quality materials or craftsmanship as a genuine article. It may also not be backed by a warranty or guarantee.
An antique is an object that is at least 100 years old. It is often valuable because of its age and rarity.
A duplicate is an exact copy of something else. It is not the original object, but it is made to look exactly like it.
In the context of the question, “This shop keeps only genuine articles,” the correct answer is A. genuine. This is because the shop only sells items that are real and authentic. The other options are incorrect because they do not describe the items that the shop sells.