Identify the Order of Reactions in the Mechanism of an Addition

Multiple Choice

Identify the order of reactions in the mechanism of an addition reaction between HCl and 2-butene.
1. reaction of a chloride ion with an intermediate to form 2-chlorobutane
2. formation of a secondary carbocation intermediate
3. addition of a proton to 2-butene

A) 1, 2, 3
B) 2, 1, 3
C) 3, 2, 1
D) 2, 3, 1