multiple choice please help :)

At John and Jay's Delicious Cookies test kitchen, engineers want to use materials to make the fastest cooling sheets for cookies after the cookies come out of the oven. The engineers are studying each material's thermal
conductivity, or how easily a material can transfer thermal energy in the form of heat.

Thermal conductivity is
measured in Wim-K.
Based on the information in the table,
Thermal Conductivity
of Different Materials
which material should the engineers use to
make the cooling sheets?

A. copper
B. bronze
C. iron
D. tungsten