Given the Weighted Voting System [38: 20, 15, 12, 5] $I \left\{ A _ { 2 } \right\}$

Multiple Choice

Given the weighted voting system [38: 20, 15, 12, 5], which of the coalitions listed are blocking coalitions?
$I \left\{ A _ { 2 } \right\}$
II $\{ \mathrm { C } , \mathrm { D } \}$
$\operatorname { III } \{ A , B , C \}$

A) III only
B) I and II only
C) I, II, and III
D) none