Calculate the molar concentration of a weak monobasic acid if the acid dissociation constant $K_a = 1.8 \times 10^{-5}$ and the degree of dissociation $\alpha = 0.01$.
- A$1.8 \times 10^{-1} \text{ M}$
- B$1.8 \times 10^{-2} \text{ M}$
- C$5.55 \times 10^{-3} \text{ M}$
- D$5.55 \times 10^{-4} \text{ M}$
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