The correct answer is D) over a hundred years ago.
Some of the technological advancements that are enjoyed today were first created over a hundred years ago.
Many of the commodities or technology that we enjoy these days were invented or developed over a hundred years ago. Electricity -for instance-changed the way people lived and prospered on planet Earth. Most of the houses in America had electricity by 1910. Another great device that improved communications was the telephone. Railroads and the invention of the car were of the utmost importance to improve transportation and connect people.
The other options of the question were A) in this past decade. B) in the past twenty-five years. C) at the .advent of the twenty-first century.
