Explanation:

A **program** is precisely defined as a set of instructions that a computer can execute to perform a specific task or achieve a particular outcome. These instructions are written in a programming language and then translated into a form the computer's processor can understand. 'Data calculation' (option a) is an action that a program might perform, but it is not the set of instructions itself. A 'file' (option c) is a collection of data or a program stored on a computer, but the file *contains* the program; it isn't the program's definition. 'Information' (option d) refers to processed data, not the instructions that process it. Therefore, 'program' is the most accurate term for a set of instructions guiding a computer's work.