What part of the report did the spaniards focus on

In a group discussion, which of these is the best example of synthesis claims into a single conclusion?

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.

How do you think entrepreneurs contribute or industry in america? describe your answer.