Wal-Mart has a highly sophisticated system of recording data and being able to view results. For instance, Wal-Mart managers know from their scanner data that five pair of Wrangler Blue Jeans were sold from 10:00 a.m. to 11:00 a.m. on a certain day, and by what size. If the sales were made via credit card, Wal-Mart also knows "who," and has developed histories of what combinations of products its customers buy. The preceding is an observational situation involving which of the following?
a. people watching people.
b. people watching phenomena.
c. machines watching people.
d. machines watching phenomena.
e. all of these are observation situations.

The company is using the system which records the data and also states the results. Through this system, the manager would able to see to watch that how many pairs have been sold in the time frame of 1 hour, of which size, payment made through which system and also the who made the sale.

So, this observational situation involve that the machine is watching or tracking the people as well as their activity. As the system or machine is keeping the track of all the things done in the company by the persons.