Solution:In matching the list items with their appropriate descriptions:
(a) Action Research is best described by IV, as it focuses on finding solutions to current probleris, typically involving a cycle of planning, acting, observing, and reflecting.
(b) Sample used, which implies the use of a subset of a pooulation for study, is most closely rela ed to III, as using a sample instead of a full population saves time, money, an energy.
(c) To know the status of literacy, which involves understanding the current level of literacy within a group or region, aligns with II, commonly achieved through survey n ethods.
(d) Case Study deals in particular with a unit or case, accurately described by I, focusing on detailed examination of a specific subject or organizational unit within its real-life context.