Let $A,B,C$ satisfy the system of equations, $\begin{aligned} A+B&=&C \\ B+C&=&A+A+A+A+A \end{aligned}$

Then $A+C$ must be equal to which of the following expressions?

$B+B$
$A+B$
$A$
$A+A+A$
$A+B+C$
$B+C$
$A+A$
$C+C+C$

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$C-B=A,C+B=5A$ ,we get $C=3A,B=2A$ .

$A+C=4A=2A+2A=B+B$