While researching a topic, a student has taken the following notes:
- In 1869, the transcontinental railroad was completed at Promontory Summit, Utah.
- Cross-country travel times fell dramatically—from several months to about a week.
- The new line helped accelerate Western settlement and commerce.
The student wants to emphasize the immediate effect the railroad's completion had on how long cross-country trips took. Which choice most effectively uses relevant information from the notes to accomplish this goal?