Compound A when reacted with PCl5 and then with ammonia gave B. B when treated with bromine and caustic potash produced C. C on treatment with HCl and NaNO2 at 0°C and then boiling produced ortho-cresol. Compound A is
(a) o-toluic acid
(b) o-chlorotoluene
(c) o-bromotoluene
(d) m-toluic acid