The Chandra X-ray Observatory was launched by which space agency?

NASA

The correct answer is Option (2) - NASA

The Chandra X-ray Observatory is one of NASA's Great Observatories, alongside the Hubble Space Telescope and others. It was launched in 1999 and has been studying the universe in X-rays ever since. While international collaboration exists in many space endeavors, Chandra was a NASA-led mission.