Two metallic wires $A$ and $B$ are of same material and have equal length. If the cross-sectional area of $B$ is double that of $A$, then which one among the following is the electrical resistance of $B$ ?

• A

  Twice that of $A$
• B

  4 times that of $A$
• C

  $\frac{1}{4}$ that of $A$
• Correct answer
  D

  $\frac{1}{2}$ that of $A$

Hence, the correct answer is option: 'D'.