Which of the following statements is `//` are correct ?
A. Compound `(C)` is meso`-cis-2,3-`dimethyl oxirane
B. Compound `(C)` is racemic `- CI - 2,3-`dimethyl oxirane.
C. Compound `(D)` is meso`-trans -2,3-`dimethyl oxirane.
D. Compound `(D)` is racemic `- trans -2,3-`dimethyl oxirane.
