[单选题]
A combination of 2.0++54 skgr o8vdow1(r /nla urfi;)v2y ub xx2hoy2aabvdw 21* $\Omega$ resistor connected in series with 4.0 $\Omega$ resistor is connected in parallel with a 3.0 $\Omega$ resistor. What is the equivalent resistance?
A. $2.0 \; \Omega$
B. $3.0 \; \Omega$
C. $4.0 \; \Omega$
D. $9.0 \; \Omega$
