which of these is a placeholder in a document into which variable data is inserted during the process of a mail merge?

Answer: C. Merge Field.

The Merge Field is a placeholder that holds the variable data that will be inserted into the main document during a mail merge procedure. The columns in a document may represent the categories of information. The Rows represent the records of the different columns. The computer counts a row of data to be a single record.

C.) Merge Field