While researching a topic, a student has taken the following notes:
* In 1897, African American inventor Andrew Beard invented an automatic coupler.
* It improved on the existing design of train car couplers.
* It made the job of connecting train cars safer.
* In 1938, African American inventor Frederick Jones invented a mobile refrigeration system.
* It improved on the existing design of food transport trucks.
* It enabled trucks to carry perishable foods farther.
The student wants to emphasize a similarity between Beard's invention and Jones's invention. Which choice most effectively uses relevant information from the notes to accomplish this goal?
Difficulty: Easy
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