A special Japanese green tea called genmai-cha contains brown rice and is
considered as a delicacy fit for a gourmet by most Japanese, though it is virtually unavailable outside Yokohama.
(A) A special Japanese green tea called genmai-cha contains brown rice and is considered as a delicacy fit for a gourmet by most Japanese, though it is virtually unavailable outside Yokohama.
(B)
Considered to be a delicacy fit for a gourmet by most Japanese, genmai-cha is a special green tea that contains brown rice, virtually unavailable outside Yokohama.
(C) A special Japanese green tea called genmai-cha contains brown rice and is considered a gourmet delicacy by most Japanese, though it is virtually unavailable outside Yokohama.
lets keep it,though using it is doubtful ,but no other error(D) Most Japanese
consider genmai-cha, [a special green tea which contains brown rice],
as a delicacy virtually unavailable outside Yokohama.
remove bracketed part and then read. "consider as" is wrong(E) Though virtually unavailable outside Yokohama, most Japanese consider genmai-cha, a special green tea that contains brown rice, a gourmet delicacy.
misplaced modifier."most japanese" are not virtually unavailable it is green tea thats virtually unavailable.So the only option that best fits is
option C.