I was going to comment how I also still don't understand but I talked through it to myself (I originally chose A).
A is incorrect because a scenario can exist where a larva tick became infected, developed to the adult stage (as an already infected adult), proceeded to feed on the one host as an adult, and then infected that person. Also, as was pointed out, extreme language; "only" is also present in A.
A is incorrect because a scenario can exist where a larva tick became infected, developed to the adult stage (as an already infected adult), proceeded to feed on the one host as an adult, and then infected that person. Also, as was pointed out, extreme language; "only" is also present in A.
![FLO – Therapy at the Club – Pre-Single [iTunes Plus M4A]](http://is1-ssl.mzstatic.com/image/thumb/Music221/v4/a4/11/88/a41188ed-0f2e-e8d5-1163-d59e373cc58c/26UMGIM30046.rgb.jpg/208x208bb.webp)
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