Lux Ladies, Inc., is a company that specializes in expensive and unusual gifts for all occasions. It keeps a large file of information on all of its regular customers, including names, addresses, and type of gifts they have ordered in the past, and the size and frequency of their orders.
The electronic file which stores this information is a(n):

A. spreadsheet.
B. MP3 file.
C. PERT file.
D. database.

D. database  

Explanation:

A database is a storing of the company or the firm data which is to be kept electronically so that the authorized person can access the information from anywhere

It could be any type of information like - regular customers in terms of name, addresses, total number of orders given by them till now, etc

So, the database is very helpful to store the large file of the company information

one of the appeals of a sole proprietorship is that business expenses are kept separate from your personal income tax return