An aromatic compound `(A), C_(8)H_(10)`, on oxidation with acidic `KMnO_(4)` gives dibasic acid. The compound `(A)` on nitration gives three isomeric nitro derivatives. The compound (A) is:
A. a.o-Xylene
B. b.m-Xylene
C. c.p-Xylene
D. d.Ethyl benzene