Correct option is A
'Mandamus' is a judicial remedy in the form of an order from a court to any government, court, corporation, or public authority, which requires them to do some specific act which that body is obliged under law to do and which is in the nature of public duty. The description that matches with 'Mandamus' is:
(a) The court finds that a particular office-holder is not doing his/her legal duty and is infringing on the right of an individual. This option correctly describes the scenario where a writ of mandamus could be issued, compelling a public official to fulfill their legal duties.