Answer
We can rank the arrangements according to the amount of charge stored:
$C_1$ and $C_2$ in parallel
$C_1$
$C_2$
$C_1$ and $C_2$ in series
Work Step by Step
Let $V$ be the battery voltage.
We can write a general expression for the charge:
$q = CV$
We can find an expression for the amount of charge stored in each situation:
$C_1$
$q = C_1~V$
$C_2$
$q = C_2~V$
$C_1$ and $C_2$ in parallel:
$q = (C_1+C_2)~V$
$C_1$ and $C_2$ in series:
$q = (\frac{C_1~C_2}{C_1+C_2})~V$
Note that: $~~(C_1+C_2) \gt C_1 \gt C_2 \gt \frac{C_1~C_2}{C_1+C_2}$
We can rank the arrangements according to the amount of charge stored:
$C_1$ and $C_2$ in parallel
$C_1$
$C_2$
$C_1$ and $C_2$ in series
