Answer:
4) B and C.
Explanation:
An improvement in the education and training of the labor force and an increase in the amount of capital used in production are the two ways from the given that increase the productivity/efficiency of resource utilization.
Efficiency in labor and productivity can be enhanced by supervising the per-unit costs of input and adjustments in labor and capital.
Improved education can also improve labor productivity because, with adequate and proper training, productivity levels will increase and resources will be better managed.