I think B. would be the best option.
The Germans helped Lenin return to Russia because they knew that his return would cause unrest and would hurt the war effort on their homefront.
Answer:
They made large-scale production possible, which increased demand and led to rapid economic growth.
Explanation:
The effect of new machinery had a great impact on the economy of Great Britain because they made large-scale production possible, which increased demand and led to rapid economic growth of the country. With the help of new machinery, goods are produced in large quantity in very less amount of time as compared to labour which takes more time so new machinery plays a key role in enhancing the economy of Great Britain.
