Answer: b. Algorithm
Explanation: Algorithm is a procedure or formula used for solving a problem, by conducting a sequence of specified actions.
In mathematics an algorithm is simply referred to as a small procedure that solves a recurrent problem.
A computer program can be said to be an elaborate algorithm.
In Summary, algorithm is the Lee down steps to follow in other to solve a problem. (A mathematical problem)
If everyone that is solving a particular problem, follows the procedure used for solving that problem(algorithm) they are supposed to arrive at the same or almost the same answer. So long as they followed the process step by step.