Ron says that because if Alicia does get bitten the wound could get infected if not treated. Ron would have to amputate it or cut it off due to the infection.
Answer:
Welp, the answer is either A or B... they both have the same result. Unless B was typed wrong... then it's A.
A chart would be better because a venn diagram is made out of overlapping circles to show possible relations between things, so a chart would be better to find individual things for them.