c
Consider the circuit as shown below.

The equivalent resistance of the circuit is,

\(R_{ eq }=1 \Omega+\frac{6 \times 3}{6+3} \Omega\)

\(=3 \Omega\)

The current is calculated as,

\(i=\frac{V}{R_{ eq }}\)

\(=\frac{9 V }{3 \Omega}\)

\(=3 A\)