Suppose $\lbrace A_i \ | \ i\in I \rbrace$ is an indexed family of sets. For each statement below, write the letter of the equivalent symbolic form.

 1. $B \cap (\bigcap_{i \in I} A_i)\not = \emptyset$
 2. $B\subseteq \bigcap_{i\in I} A_i$
 3. $B \subseteq (\bigcup_{i \in I} A_i)$

A. $(\forall x \in B)(\exists i \in I)(x \in A_i)$
B. $(\forall x \in B)(\forall i\in I)(x \in A_i)$
C. $(\exists x \in B)(\forall i \in I) (x \in A_i)$