Answer:
A is the correct answer.
Explanation:
The law of diminishing returns assumes that there won't be any change in the technique of production and if the production technique changes then the efficiency of the production would increase. This law is applicable only when the method of technology remains unchanged. The law is applicable only in the short run because the supply of many factors can't be increased in a short period. The units of variable factors are also considered to be homogeneous.