What is the slow, rate-determining step, in the acid-catalyzed dehydration of 2-methyl-2-p...

What is the slow, rate-determining step, in the acid-catalyzed dehydration of 2-methyl-2-propanol?

A) Protonation of the alcohol to form an oxonium ion.

B) Loss of water from the oxonium ion to form a carbocation.

C) Loss of a β-hydrogen from the carbocation to form an alkene.

D) The simultaneous loss of a β-hydrogen and water from the oxonium ion.