Uranus was discovered by William Herschel in 1781. While the spelling in option A is 'Hershel' instead of 'Herschel', this is clearly referring to the correct discoverer. The other options are all incorrect - Ganleo appears to be a misspelling or fictitious name, Copernicus lived centuries before Uranus was discovered, and 'None of these' is incorrect since Herschel did discover it.