脑脓肿可分为（）。

A.耳源性、血源性（转移性）、外伤性、结核性

B.耳源性、血源性、外伤性、结核性、隐源性

C.耳源性、血源性、外伤性、鼻源性、结核性

D.耳源性、血源性、外伤性、鼻源性、隐源性

E.耳源性、血源性、化脓性、结核性、真菌性

Steve Waters, a CFA Level I candidate, has decided to enter into a long position of Farmco stock. Since Farmco is thinly traded, Waters is concerned the order will overwhelm the liquidity of Farmco and the price will surge. Waters engages in a series of block trades in order to accomplish the purchase. According to Standard Ⅱ (B) , Market Manipulation, Waters has engaged in:（）

A. neither transaction - based manipulation nor information - based manipulation.

B. transaction - based manipulation, but not information - based manipulation.

C. both transaction - based manipulation and information - based manipulation.