Read the following claim from an essay:

the benefits of exploring space justify the high cost.

which of the following is the most relevant piece of evidence for this claim?
a. a speech by an expert on space travel that describes the history of space exploration from the beginning of the space era to the present day
b. a website that has articles about the planets in our solar system and the resources we might someday find on them
c. a government report on how the prices of goods and services have changed since the early days of space exploration
d. a magazine article describing how people's lives have been improved by products developed as a result of the space program