Which statement concerning the biological agents used in terrorist attacks is true?

A) The biological agents used by terrorists are more potent than those that occur naturally
B) It may take several days to weeks to realize or determine that an attack involving biological agents occurred
C) Rain is the ideal condition to disperse a biological agent because water will spread it over a greater area
D) The eyes are the most effective portal of entry into the human body for a biological agent

B) It may take several days to weeks to realize or determine that an attack involving biological agents occurred