Electrical resistance is directly proportional to the length of the wire.
[tex]R\propto length[/tex]Electrical resistance is inversely proportional to the area of the cross section.
[tex]\begin{gathered} \text{R }\propto\text{ Ar}ea \\ R\propto\pi(radius)^2 \\ R\propto diameter \end{gathered}[/tex]Electrical resistance is directly proportional to the resistivity
[tex]R\propto resistivity[/tex]Thus, the correct option is all of the above.
