Answer:
Correct answer is B. technology.
Step-by-step explanation:
B is the correct because since the introduction of new technologies during the industrial revolution things have totally changed, and human labor was quickly in certain areas changed with machines, or as put in the statement technology.
A is not correct because gross domestic product is the market value, and is a wider term.
C is also not correct as is not logically connected with the conclusion, as it goes with d.