According to the Feenstra-Hanson model of offshoring, if Japan is skilled-labour abundant and Mexico is unskilled-labour abundant, once the most unskilled-labour intensive task is offshored from Japan to Mexico, the skilled-unskilled wage ratio will:

(a) Decrease in both countries.

(b) Increase in Japan but decrease in Mexico.

(c) Decrease in Japan but in increase in Mexico.

(d) Increase in both countries.

Explain your answer clearly.