The table indicates the condition of materials P, Q, R and S, and whether free electrons are present in each one. From the information in the table, which comparison of thermal conduction in the materials is correct?
- AIt is better in P than in Q and S.
- BIt is better in Q than in R and P.
- CIt is better in R than in Q and P.
- DIt is better in S than in R and Q.