His style of writing is quite verbose.

Answer: Option B

Verbose : using or expressed in more words than are needed.
Lucid : expressed clearly; easy to understand.
Succinct : (especially of something written or spoken) briefly and clearly expressed.
Unusual : not habitually or commonly occurring or done.
Comical : amusing, especially in a ludicrous or absurd way.

Antonym of Verbose is Succinct