The key to providing controlled variability in algorithms is to employ one or more placeholders, called Select one a. methods b. numbers c. parameters d. polynomials e. functions

c. parameters

Explanation:

Parameters are simply placeholders (sometimes called dummy variables) used mainly by methods to perform their given tasks so as to provide controlled variability in the program (or algorithm). Sometimes they are called arguments. But then it is much more specific to simply use parameters rather than arguments because arguments are the variable values that the parameters are serving as placeholders for.

Parameters identify and describe values that are passed into a function or subroutine.

Parameters are also used for simulation and testing purposes where the input s to the program are or can be varied.

PS: Methods are just functions performed by a class in a program.