Which Organizational Method Is Used in a Speech with the Following

Multiple Choice

Which organizational method is used in a speech with the following main points.
I. Caused by the bite oinfected mosquitoes, West Nile virus has spread throughout the United States.
II. The effects oWest Nile virus include flu-like symptoms, convulsions, swelling othe brain, and, in some cases, death.

A) topical
B) causal
C) scientific
D) analytical
E) spatial