Plagiarism can not be detected by:

Correct option is A

Scopus is a database that provides access to a large collection of journals and research papers. It does not function as a plagiarism detection tool. It is primarily used for literature searching, citations, and academic research tracking.
Turnitin, Ithenticate, and Urkund are all plagiarism detection tools that compare a document against a large database of texts to detect similarity or copied content.