Question

a feature that lets you protect or modify a particular area; created using a marquee.
mask
brush
pin
paint

Explanation:

A mask is a feature used in graphic - design software to protect or modify a particular area. It can be created using a marquee tool to select an area first. Brushes are for painting, pins are for marking or holding elements in place, and paint is a general term for coloring, none of which fit the description as well as a mask.

Answer:

A. Mask