[单选题]
A 2.0 $\Omega$ resistor is in series with a parallel combination of 4.0 $\Omega$, 6.0 $\Omega$, and 12 $\Omega$ resistors. What is the equivalent resistance of this combination?
A. $24 \; \Omega$
B. $4.0 \; \Omega$
C. $1.8 \; \Omega$
D. $2.7 \; \Omega$
