If A and B are two events such that $A ⊂ B$ and $P(B) ≠ 0$, then which of the following is correct?

Question

$$\begin{array} ((A) P(A|B)= \frac{P(B)}{P(A)} \quad & (B) P(A|B) < P(A) \\ (C) P(A|B) ≥ P(A) \quad & (D) None\: of\: these \end{array}$$