Who was the scientist who discovered the telescope?

Correct answer: (d) Galileo

Explanation

Galileo Galilei built his own improved telescope in 1609 and was the first to use it to study the sky: he saw the moons of Jupiter and the craters of the Moon.

The very first telescope was made in the Netherlands (Hans Lippershey, 1608), but of the options, Galileo is the answer.