Final answer:
The correct answer is d. Hans and Zacharias Janssen. They experimented with glass lenses and a tube and found that objects could be greatly magnified.
Step-by-step explanation:
The correct answer to the question is d. Hans and Zacharias Janssen. In the sixteenth century, Hans and Zacharias Janssen, Dutch spectacle makers, experimented with glass lenses and a tube and discovered that objects could be greatly magnified. Their invention of the telescope paved the way for advancements in observing distant objects and revolutionized our understanding of astronomy.