Which function allows you to replace text within a character string in SAS?

The function that allows you to replace text within a character string in SAS is the tranwrd function. This function stands for "translate word" and is specifically designed to replace all occurrences of a specified substring with a different substring within a given character string.

When using tranwrd, you specify the character string where the replacement will take place, the substring you want to find, and the substring you want to replace it with. The result is a new character string that incorporates the specified replacements.

For instance, if you have a string that contains the word "apple" and you want to replace it with "orange", using tranwrd will effectively alter the original string wherever "apple" appears.

The other options, while they may sound plausible, do not exist in SAS for this particular function. The replace function is not recognized in SAS; there is no change function for text replacement, and substitue is not a valid function in SAS as well. Thus, the choice of tranwrd is the appropriate and correct function for replacing text in SAS character strings.