If the $pH$ of the aqueous solutions $A, B, C$ and $D$ are $1.9, 2.5, 2.1$ and $3.0$ respectively,then what will be the order of acidity?
- A$A < C < B < D$
- B$D < C < B < A$
- C$D < B < C < A$
- D$D > C > B > A$
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