When sales are made in a local Walmart, the sales data is sent to Walmart headquarters where the data are used to build a picture of the buying habits of people who shop at individual Walmarts across the nation. The use of makes this possible.

The question is incomplete:

When sales are made in a local Walmart, the sales data is sent to Walmart headquarters where the data are used to build a picture of the buying habits of people who shop at individual Walmarts across the nation. The use of makes this possible.

A) POS systems

B) social shopping

C) e-commerce

D) e-menus

E) direct selling

A) POS systems

Explanation:

-POS System refers to the equipment and software that retailers use in their stores to register the sales. This system has the information about the sales, the inventories and CRM.

-Social shopping is a method that is used for online shopping that tries to involve friends in the purchasing experience.

-E-commerce  refers to purchasing and selling goods online.

-E-menus is a system used by restaurants that allows to order food through an electronic device.

-Direct selling refers to selling directly to consumers without using intermediaries.

According to this, the answer is that the use of POS systems makes this possible because these systems have the information from stores like sales and inventory that allows to analize people's buying habits.

answer (b); /// a method of measuring the opinions of a large group of people by selecting a subset of the larger group, asking them a set of questions and then generalizing those responses;