Question

A potential difference of 2.0 V is applied across a wire of cross sectional area 2.5 mm2. The current which passes through the wire is 3.2 × 10-3 A. What is the resistance of the wire?

Answer 1

R(in ohms)=V (in Volts)/I (in Amps)

Answer 2

Here you can simply use Ohm's Law. V = IR.
The cross sectional area is superfluous.

Answer 3

6.3 × 102 Ω
4.2 × 102 Ω
3.6 × 102 Ω
2.8 × 102 Ω

tese are the choices can anyone help me with the answer

Answer 4

We have already helped with the answer, you only have to make a simple division. I assume, and think that @qpHalcy0n also does, that that part you can do yourself.

Good luck and come back with your choice if you want us to verify