In excel, an anchor($) allows you to:
a. easily fill a series such as 1, 2, 3 to the highest number you choose.
b. hold a cells column and/or row reference in a formula constant.
c. conditionally format the text in a cell.
d. refer to data in another worksheet.
e. deal with someone who likes to snich.

The correct answer is B. Hold a cell's column and/or row reference in a formula constant.

Explanation:

In Excel or similar programs with cells, an anchor refers to a tool that allows you to hold a formula constant in a cell, set of cells, column or row, which means it the results from the formula would be the same or the formula would not be modified if you copy it to another cell. This tool can be incorporated by pressing F4 that will show a $ symbol before the row and column number of the cell you anchored. Additionally, this option is useful because it allows users to keep formulas constant. According to this, it can be concluded anchor allows you to "Hold a cell's column and/or row reference in a formula constant".