Question

Select the correct text in the passage.

Jonah is reading a blog post on the history of GPS, but he's pretty sure it is mostly unreliable. Can you find the one reliable sentence in the post?
The Global Positioning System (GPS) was first used by the US Air Force as a navigation experiment in the 1960s. Using five satellites orbiting the
poles, the air force could observe changes in frequency that could pinpoint a submarine's location in a matter of seconds.
Today, GPS is used for mapmaking, farming, air travel, and many other commercial and military uses. Modern GPS technologies are not built to
provide directions or locate your phone or tablet.

Answer 1

The correct text is : The Global Positioning System (GPS) was first used by the US Air Force as a navigation experiment in the 1960s.

How is this text correct

The indicated sentence in the passage provides reliable information about the origin of the Global Positioning System (GPS).

It states that the GPS was initially utilized by the US Air Force in the 1960s as part of a navigation experiment.

This fact aligns with the historical development of GPS technology, which indeed had its beginnings in the 1960s as a project primarily led by the US military.