Final answer:
2,3-dibromobutane is a chiral molecule because it has four different atoms or groups connected to a central carbon.
Step-by-step explanation:
An object or molecule that cannot be superimposed on its mirror image by any translation, rotational, or conformational changes is a chiral object. An object or molecule that is identical to its mirror image is achiral. In the case of 2,3-dibromobutane, it has four different atoms or groups connected to a central carbon, making it a chiral molecule. Therefore, the correct answer is A) Chiral.