Let $A = \{1, 3, 5, 7, 9\}$ and $B = \{2, 4, 6, 8\}$. If an ordered pair $(a, b)$ is chosen at random from the Cartesian product $A \times B$,what is the probability that $a + b = 9$?
- A$\frac{3}{2}$
- B$\frac{3}{4}$
- C$1$
- D$\frac{1}{5}$
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