The inference is that the factor that will be cured as contributing to the phenomenon described is D. The construction of the Transcontinental Railroad.
What is an inference?
An inference is the conclusion that can be deduced based on the information given in a story.
In this case, the inference is that the factor that will be cured as contributing to the phenomenon described is the construction of the Transcontinental Railroad.
Learn more about inference on:
brainly.com/question/25280941
#SPJ1
