Final answer:
Improved transportation techniques significantly boosted production efficiency in the England and United States steel industry.
Step-by-step explanation:
Improved transportation techniques played a significant role in the England and United States steel industry. The expansion of railroads across both countries allowed for the transportation of more freight and materials, including steel. This led to increased production efficiency, as rail lines became heavier and stronger to support heavier loads and locomotives. Therefore, option A) They significantly boosted production efficiency, is the correct answer.