Answer:
The correct option here is C) significantly relaxed immigration standards.
Explanation:
All of the above option would help in increasing the labor wage rate except relaxation in the immigration standards because in case of relaxation of immigration standards the supply of labor in the market will increase, which means now the employers have the option of substituting current employees who earning higher wages with immigrant workers , who are ready to work for cheap, so with the availability of more supply of labors the net output can be increased but the labor wages cannot.
