\textbf{181.} In the circuit shown, what is the current passing through battery $\varepsilon_2$, in amperes? (Both batteries are ideal.)
\begin{center}
\textit{[Figure: Circuit with $\varepsilon_1 = 12\,\text{V}$, $r_1 = 0$, $\varepsilon_2 = 16\,\text{V}$, $r_2 = 0$, and resistors $2\,\Omega$, $4\,\Omega$, $3\,\Omega$, $6\,\Omega$, $8\,\Omega$ connected in a network.]}
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\begin{itemize}
\item[(1)] $0.5$
\item[(2)] $1.5$
\item[(3)] $2$
\item[(4)] $2.5$
\end{itemize}