Critical Reasoning (CR) | Re: Gmatclub Verbal Diagnostic test No 5, Question No 2 CR

Understood it as an infer kind of question.:
Option B to me, would love the OA and OE:

A chemo therapy used for treating abdominal cancerblocks the receptors in the digestive tract , when somebody takes theanti - cancer chemical within two hours of ingesting any nicotine product; however the chemical loses the cancer - blocking trait when the treatment is repeated four or five times in a day. Scientist think that nicotine contains some factor that turns the receptors upside-down, thus resulting
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