Answer:

Copper wire of diameter 0.5 cm and length 10 cm will offer less resistance.

Explanation:

Both the wires have same length, so length is constant.

As per the Ohm's Law,

                        Resistivity = ρ * Length/Area of cross section

Resistivty is inversely propotional to area of cross section. More the area of cross section, less the resistivity.

Area of cross section will be more with bigger diameter.

0.05 cm < 0.5 cm

Therefore, copper wire of diameter 0.5 cm and length 10 cm will offer less resistance.