Which of the following arguments could be used to support the placement of the helicopter on a timeline before the invention of a radio amplifier even though both were invented in 1907?

• the helicopter was a major breakthrough in transportation that increased the ability to transport goods across the country.
•the helicopter is used to transport people in emergency situations to life-saving medical treatment.

•the helicopter expanded the role of aviation and led to greater research and development of air travel.

•the helicopter is more useful than radio amplifiers and would likely be used more by the public.