- 'React' -> 'Source Code URL' -> 'https://github.com/facebook/react' is correct, as this is the primary and official source code URL for React (the version history and number of watchers/forks/stars are useful proxies to help confirm this)
- 'Solidity' -> 'Source Code URL' -> 'https://github.com/ethereum/solidity' is correct, as this is the primary and official source code URL for React (the version history and number of watchers/forks/stars are useful proxies to help confirm this)
- 'React' -> 'Source Code URL' -> 'https://github.com/facebook' is incorrect, as while https://github.com/facebook has a repository containing React's primary and official source code, https://github.com/facebook is not itself a direct link to React's source code.
- 'React' -> 'Source Code URL' -> 'https://github.com/Hacker0x01/react-datepicker' is incorrect, as 'https://github.com/Hacker0x01/react-datepicker' is a package built for React applications, but not the primary and official React source code URL.
- 'Solidity' -> 'Source Code URL' -> 'https://github.com/ethereum/solidity-blog' is incorrect, as while this source code URL is officially associated with Solidity as its blog, it is not the primary source code URL