The obstacles that were faced by the Central and Union Pacific region workers are harsh weather conditions. Thus, option C is correct.
The building of railroad network in the Central and Union Pacific region is followed with great difficulties and challenges.
<h3>What are challenges faced by the workers</h3>
The railroad was constructed at the terrain region. It is hard to deal with the conditions. The poor workers laid on mountains in the pacific region, and risk their lives with granite and explosives.
The difficulty faced by the workers of Union and Central Pacific region is the harsh weather conditions. Thus, option C is correct.
Learn more about Central Pacific, here:
brainly.com/question/7382089
A West African ruler converts to Islam.
Answer: Option D
<u>Explanation:</u>
- The post classical era marked expansion of civilizations and development of trade. International trade developed even beyond Silk Road expanding to Europe, Africa, Asia.
- Islam started spreading based on the revelation of prophet Muhammad in the Arabian Peninsula. Islam had a reflection of Jews, Christians and Zoroastrians.
- Islam started spreading widely in Africa, Europe and Asia due to invasions, expansions, merchants and trade activities.
- Africa was the first continent to be converted to Islam. Almost one third of the Muslims are in this continent.
1) few advancements in scientific knowledge were made
