Single-Step Reaction

Correct Answer: B

Tertiary alkyl halides when plopped into protic solvents (like water!) are prone to Sn1 and E1 elimination reactions. Usually Sn1 reactions predominate at lower temperatures, but if you increase the temperature you favor the E1 elimination product. So if you said D) you’re good. But definitely not A) or C). Remember, Sn2 reactions never occur on tertiary electrophiles and for E2 you need a strong base!