Read the passage below from "The Unseen Values." Scientific research has never been amenable to rigorous cost accounting in advance. Nor, for that matter, has
exploration of any sort. But if we have learned one lesson, it is that research and exploration have a remarkable
way of paying off-quite apart from the fact that they demonstrate that man is alive and insatiably curious. And we
all feel richer for knowing what explorers and scientists have learned about the universe in which we live.
Which type of appeal can be inferred from the statement above?
An appeal to emotion
An appeal to morality
An appeal to ethics
An appeal to reason